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A normal distribution has a mean of 50 and a standard deviation of 3 , the probability P(X ≤ 44) = P(Z ≤ -2) = 0.0241  option a) 0.025.

In probability theory, normal distribution is also known as Gaussian distribution. It is a probability distribution that is symmetrical, bell-shaped, and a continuous probability distribution. It's also a part of continuous probability distribution that describes real-valued random variables whose probability density function is affected by two parameters: the mean μ and the variance σ².

Let us consider the problem. Suppose a normal distribution has a mean of 50 and a standard deviation of 3. Firstly, we need to standardize the random variable X that is to convert it to the standard normal distribution. We use the following formula for this Z = (X - μ) / σwhere X is the random variable and μ is the mean, σ is the standard deviation of the population.

So in this case, we can write this as Z = (44 - 50) / 3 = -2

We have now obtained the standard score or standard deviation for the random variable X.

Now we need to calculate the probability P(X ≤ 44) = P(Z ≤ -2).

The probability of Z being less than -2 is denoted by the area under the standard normal curve to the left of Z = -2.

Using the standard normal table we look for the probability that corresponds to -2 and the closest we find is 0.0228.

This probability represents the area under the standard normal distribution to the left of Z = -2.

To calculate the area to the left of Z = -2, we add the area to the left of the next integer, which is -3, which we find from the standard normal table as 0.0013, 0.0228 + 0.0013 = 0.0241.

Therefore, the probability P(X ≤ 44) = P(Z ≤ -2) = 0.0241 or 0.025 (rounded to three decimal places)Therefore, the answer is option A. 0.025.

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Answer:

Step-by-step explanation:

Part A

The probability of finding a red marble. P(red) = red / total

Total = red +  yellow +  blue

Total = 2 + 4 + 3

Total = 9

P(red) = 2/9 = 0.22222

Part B

P(blue) = blue / total

P(blue) = 3/8 = 0.375

This  means that the red marble is permanently gone. The total is different. It is eight not nine.

Part C

The probability of red followed by blue is just the answers to A and B multiplied.

P(red) followed by blue = 2/9 * 3/8

P(red) followed by blue = 0.22222 * 3.75

P(red) followed by blue = 0.0833333

If you are confident of your concellation abilities you could do this as

P(red followed by blue) = 2/9 * 3/8 = 1/3 *1/4 = 1/12 = 0.083333....

Part D

Removing the first marble had the affect of reducing the total number of marbles to 8 and the number of reds from 2 downto 1

Part E

The answer here is 1/12.

Answer:7

Step-by-step explanation:

Answer:x=-3 y=26

Step-by-step explanation:

3x+y=17.............(1)

x+2y=49..............(11)

From (11) x=49-2y

Substitute x=49-2y in 3x+y=17

3(49-2y) + y=17

Open bracket

147-6y+y=17

147-5y=17

Collect like terms

5y=147-17

5y=130

Divide both sides by 5

5y/5=130/5

y=26

Substitute y=26 in x+2y=49

x+2(26)=49

x+52=49

Collect like terms

x=49-52

x=-3

Answer:

It has a single solution: x = -3, y = 26.

Step-by-step explanation:

Answer:

The height is 1.25m.

Step-by-step explanation:

Volume = 1/3 πr²h

Given:

V = 13.4 m³

r = 3.2 m

Asked: height (h)

Substitute the formula with the given values then solve

13.4m³ = 1/3π(3.2m)²h

13.4(3) = 10.24πh

40.2 = 10.24πh

h = 40.2/10.24π

h = 1.25m

The height of the cone is 1.25 meters.

We know that the volume of the cone is given by

V = (1 / 3) * π * r ^2 * h................equation 1

where,

V is the volume of the cone.

r is the radius of the cone's base

h is the height

The volume and radius of the cone are given,

V = 13.4 m

r = 3.2m

substituting these values in equation 1 we get,

13.4 = (1 / 3) * 3.14 * 3.2 ^ 2 * h

on simplifying further

13.4 = 10.717  * h

h = 1.25m

The height of the cone is 1.25 meters.

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Analyze picture

since both sides are congruent, ang H-I-G= angle H-G-I

angle H-I-G=32 degrees, so H-G-I is 32 degrees as well

180-32-32=

180-64=

116

x=116 degrees

it is an obtuse triangle

Answer:

2.7 x 10 7

Step-by-step explanation:

This is the correct answer !

Answer:

14 = 14

Step-by-step explanation:

(4 + 2) + 8 = 14

6 + 8 = 14

14 = 14

Answer:

the number of feet of fencing she would need to enclose her garden 250 feet.

Step-by-step explanation:

L= length, B = breadth

LB=2500 (AREA)..............................i)

B=4L....................................................ii)

substitution:-

L x 4L = 2500

L^2 = 2500/4

L= 25

B=4L

 =4x25

 =100

L=25, B=100

hence,

peri=  2(L+B)

      =  2(125)

= 250 feet.

(a) The mathematical notations is (xₙ, yₙ)

(b) The alternative hypotheses using the notations defined in the previous question is t = (Xₙ - Yₙ) / SE

(c) The assumptions making is variances of the two populations are equal.

A hypothesis is a tentative explanation or prediction of a phenomenon, and it is essential in scientific research. In this study, we have two hypotheses:

Null Hypothesis: There is no significant difference in the average number of Copepod between the reduced pH and neutral pH snowmelt treatments.

Alternative Hypothesis: There is a significant difference in the average number of Copepod between the reduced pH and neutral pH snowmelt treatments.

Model:

A model is a mathematical representation of a phenomenon, and it is used to make predictions or explanations. In this experiment, we can create two simple models:

Model for Neutral pH Snowmelt:

Let Yₙ be the number of Copepod in a microcosm treated with neutral pH snowmelt. Then, Yₙ follows a normal distribution with mean µn and standard deviation σn.

Model for Reduced pH Snowmelt:

Let Yₙ be the number of Copepod in a microcosm treated with reduced pH snowmelt. Then, Yₙ follows a normal distribution with mean µr and standard deviation σr.

Assumptions:

Before conducting a t-test, we must ensure that the data satisfies the following assumptions:

The sample is a random and representative sample of the population.

The data is normally distributed.

The variances of the two populations are equal.

The test statistic for the t-test is:

t = (Xₙ - Yₙ) / SE

where Xₙ is the sample mean of neutral pH snowmelt, Yₙ is the sample mean of reduced pH snowmelt, and SE is the standard error.

Assuming a level of significance v = 0.05, we have a critical value of t = 2.306 for a two-tailed test with 4 degrees of freedom. If our calculated t-value is greater than 2.306 or less than -2.306, we reject the null hypothesis.

We can perform a randomization test as follows:

If the p-value is less than 0.05, we reject the null hypothesis and conclude that there is a significant difference in the average number of Cope pod between the reduced pH and neutral pH snowmelt treatments. If the p-value is greater than 0.05, we fail to reject the null hypothesis.

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Mean - this is the average. Add up the numbers and divide by the count of the numbers in the data set.

11+13+14+16+17+18+20+20+21+24+25+29 = 228

There are 12 numbers, so divide by 12.

228/12 = 19. The mean is 19.

Median - - - this is the MIDDLE number. Your data is already in numerical order (hooray!) so there are 12 numbers. Since it's even, we'll take the average of the 2 middle numbers. The 6th number is 18 and the 7th number is 20. The average of these is 19. So the median is 19.

(Side note: yes, median and mean can be the same.)

Mode - - - this is repeat/most common numbers! 20 repeats. 20 is the mode.

Range - - - biggest number is 29, littlest is 11. The range is 29-11 = 18.

Answer:

The triangles are similar.

Explanation:

Similar triangles have 3 pairs of congruent angles. In this diagram, we can see that the triangles WXP and WYZ share angle W, which is congruent to itself; therefore, they have at least 1 pair of congruent angles. We are given that angle X is congruent to angle Y, so that is a second pair of congruent angles. Finally, we know that angle P is congruent to angle Z because if two pairs of corresponding angles are congruent, then the third pair must also be congruent because the measures of the interior angles of both triangles have to add to 180°.

Answer:

the answer is b, c, d, a, respectively

No, the rank of the product of two n by n square matrices A and B, denoted as AB, cannot be less than n-1 if both A and B have ranks of n-1.

According to the Rank-Nullity theorem, for any matrix M, the sum of its rank and nullity is equal to the number of columns in M. In this case, the number of columns in AB is n, so the sum of the rank and nullity of AB must be n.

If rank(A) = rank(B) = n-1, it means that both A and B have nullity 1. The nullity of a matrix is the dimension of its null space, which consists of all vectors that get mapped to the zero vector when multiplied by the matrix. Since both A and B have rank n-1, their null spaces consist only of the zero vector.

Now, considering AB, if the rank of AB were less than n-1, it would mean that the nullity of AB is greater than 1.

However, this would violate the Rank-Nullity theorem since the sum of the rank and nullity of AB must be n, which is the number of columns.

Therefore,  if rank(A) = rank(B) = n-1, the rank of AB cannot be less than n-1.

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Answer:

there is no answer without picture

Step-by-step explanation:

sorry cant answer

Answer:

11.5

Step-by-step explanation:

Using pythagoras theorem

A.91 is 3.5% of what number

1) Considering that 91 defective bolts correspond to 3.5% of the total sample.

2) So we can write out the following ratio:

Note that we have cross multiplied.

Since 100% is equivalent to the total number, thus we can state that 2600 bolts were inspected.

And the answer, since we need to reread it is in other words asking:

A.91 is 3.5% of what number

Answer:

The area of a triangle is:

Area = 1/2(bh)

Area = 1/2(70)

Area = 35 square inches

Let me know  if this helps!

Answer:

The rate is 5 dollars per student.

Step-by-step explanation:

The rate per student can be found with \(\frac{dollars}{student}\):

\(\frac{150dollars}{30student}=5\frac{dollars}{student}\\\\\frac{350dollars}{70student}=5\frac{dollars}{student}\)

The rate is 5 dollars per student.

Answer:

The equation 1+0=1

Step-by-step explanation:

Other options are not eligible because

1 option -Natural numbers cannot be closed under subtraction

2 option-The equation is not having proper rational numbers, they are decimals

3 option-Whole numbers cannot be closed under subtraction

Thank you!

Answer:

5/4, just sub in x

Step-by-step explanation:

It is given that AD = AC is the midpoint of the segment DC.  Therefore, DB = BC by the definition of the midpoint making the segment AB as a bisector. Additionally, ∠D is congruent to the angle ∠C by the definition of the vertical angle theorem. Triangle ΔADB is congruent to triangle ΔACB by SAS theorem.

Since angles like ∠ ABD and ∠ABC are a linear pair adding up to 180 and congruent by linear pair postulate. This means that the angle ABD and ABC each measures 90 degrees. Therefore, segment AB is perpendicular to segment DC by midpoint isosceles theorem making segment AB both as a bisector and perpendicular to the segment DC.

What is midpoint theorem?

Midpoint theorem defines the center point of a line segment which forms the triangle. And the sides of the triangle are equal with one side is parallel to the remaining sides.

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Given two simultaneous linear equation

- x + 2y = 10 ------------1

- 3x + 6y = 11 ------------2

This can be solved using three different method, substitution, elimination and graphical methods

I will use substitution method

make x subject of the formular in equation 1

-x + 2y = 10

2y = 10 + x

x = 2y -10

substitute x = 2y - 10 in equation 2

-3x + 6y = 11

-3(2y - 10) + 6y = 11

remove the bracket

-6y + 30 + 6y = 11

-6y+6y = 11 - 30

0 = -19

thus since y is gone, there is no solution

Second option is the answer

Answer:

I am not quite sure but I say 2 quarts and 15 pints.

Answer:

The sequence is increasing by 5 at each step. So, we can write:

a1 = 30

a2 = 30 + 5 = 35

a3 = 30 + 25 = 40

a4 = 30 + 35 = 45

a5 = 30 + 4*5 = 50

We notice that the nth term is given by:

an = 30 + (n-1)5

So, the explicit formula for the nth term is:

an = 25n + 5

The amount of the tv in 3 years which depreciates at a rate of 4% per year is £708 .

We have given principal amount =  £800 , rate = 4% and time = 3 years .

Putting above values in equation (1) , we get

        \(A=800(1-\frac{4}{100} )^3\\A= 800(1 -0.04)^3\\A=800(0.96)^3\\A=800\times 0.88\\A= \£707.78\)

Note that the minus sign is due to depreciation .

On rounding off , amount will be £708 .

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Answer: B = 15 kph or 15 kph

step by step

(b-5)*10=(b+5)*5

10b-50=5b+25

5b=75

b=15 kph in still water

The family's monthly payment should be $504.70.

We can use the following formula:

\(P = (r * A) / (1 - (1 + r)^(-n))\)

where

In this instance, the total loan amount is $43,008, the total number of payments is 9 years * 12 months/year = 108 months . The yearly interest rate must first be divided by 12 to determine the monthly interest rate. Assume that there is a 5% yearly interest rate.

\(r = 0.05 / 12 = 0.00417\)

Now we can substitute the values into the formula and solve for P:

\(P = (0.00417 * $43,008) / (1 - (1 + 0.00417)^(-108))\)

= $504.70

Therefore, the family's monthly payment should be $504.70.

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Answer:

Step-by-step explanation:

Typically yes you need to know

Mean

Median

Mode

and Range

Mean = average, add all numbers then divide by how many

Median = midpoint, middle number.  Be sure to list numbers from small to large if there are 2 middle numbers (this happens when there are an even amount), take the average of the 2 middle numbers

Mode = numbers that occurs the most in the list of numbers

Range = This is the largest number minus the smallest number.