Although Dan's psychology class is sometimes longer or shorter than usual, on average each class is 50 minutes. If the lengths of these classes form a normal curve, which statistic would enable Dan to estimate the probability that any single class will last somewhere between 47 and 53 minutes?

Answers

Answer 1

Answer:

Answer:

the sample standard deviation

Step-by-step explanation:

The statistic that would enable Dan to estimate the probability that any single class will last somewhere between 47 and 53 minutes is the sample standard deviation. If we have the mean and the standard deviation and we know that the lenghts of the classes form a normal curve, we can compute probabilities either with the empirical rule or using a table of probabilities from a book. The normal distribution is completely determined with the mean and the standard deviation.

Option C is the correct answer.

Step-by-step explanation:

We need to find 25 x = 65

Dividing both sides by 25

We will get

$25x=65\n\n(25x)/(25)=(65)/(25)\n\nx=(13* 5)/(5* 5)\n\nx=(13)/(5)\n\nx=2.6\n\nx\approx 3$

Option C is the correct answer.

The calculated value of x in the equation 2/5x = 6/5 is (c) 3

How to calculate the value of x in the equation

From the question, we have the following parameters that can be used in our computation:

2/5x = 6/5

Divide through the equation by 2/5

So, we have the following representation

(2x/5)/(2/5) = (6/5)/(2/5)

Evaluate the quotient on the right hand side

(2x/5)/(2/5) = 3

Lastly, we have

x = 3

Hence, the value of x in the equtaion is x = 3

Answers

Answer:

The coefficient ( ) of 5a is filled by $(41)/(5)$ and the coefficient ( ) of a² is filled by ' 0 '

Step-by-step explanation:

The given expression is 6a - ( )5a = ( )a² - 35a

To find the missing coefficient, compare the left and right side of expression,

First compare the 6a - ( )5a = - 35a

6a+35a = ( )5a

41a = ( )5a

divide both the sides by 5a,

$(41)/(5)=( )$

The coefficient ( ) of 5a is filled by $(41)/(5)$

Now, compare 0 = ( )a²

So, the coefficient ( ) of a² is filled by ' 0 '

Hence, The coefficient ( ) of 5a is filled by $(41)/(5)$ and the coefficient ( ) of a² is filled by ' 0 '

(6a-7)5a=30a2-35a is the answer

Xian and his cousin Kai both collect stamps, and Kai has 68 stamps. The boys recently joined different stamp collecting clubs. Xian’s club sill send him 12 new stamps per month. Kai’s club will send him 8 new stamps per month. After how many months will Xian and Kai have the same number of stamps? How many stamps will each have?

Answers

Assuming that Xian starts with 0 stamps, you set the equations equal to each other to find what month they have the same amount of stamps.

(68 from Kai's original stamps) (8 from how many per month)
(0 from Xian's original stamps) (12 from how many per month)
68+8m=0+12m
solve for m in this equation and you get 68=4m
and 68/4 = 17 months

For how many stamps each will have, you plug in 17 into m in Xian's equation (you could do either but Xian's is easier):
0+12m
0+12(17)=204
204 stamps.

Hope this helped, it was kinda long lol

What does x-4y=-4;x=-2,4,6 (solve for y then find the value of y for each value of x

Answers

: Solve the equation for y. Then find the value for y for each value x. 6x=7-4y; x= ... You can put this solution on YOUR website! 6x=7-4y 4y=-6x+7 4y/4=(-6x+7)/4 y=(-6x+7)/4===================== x=-2 y=(-6(-2)+7)/4 y=(12+7)/4

Write the equation of a line in slope intercept form that passes through (3,-2) and (0,-5)

Answers

Answer:

y=x-5

Step-by-step explanation:

First, you find the slope by -2-(-5)/3-0. This would be 3/3 which is equal to 1. Then you plug in the x with any point you want. I'm going to use (3,-2). The equation should look like -2=3+y. Now we find what is y. Therefore for this equation to be true. Y is equal to -5. Now put it all together. Y=x-5. You can use the other point to check my answer! Hope that helps!!

What is the simplified form of the equation fraction 4 over 5 n minus fraction 3 over 5 equals fraction 1 over 5 n?n = 1
n = −3
n = fraction 3 over 4
n = fraction 1 over 4

Answers

Simple...

so you have...

$(4)/(5) n- (3)/(5) = (1)/(5) n$

You want to isolate the variable,n,....

so subtract....

$(4)/(5) n- (3)/(5) = (1)/(5) n$
$- (4)/(5)n$ $-(4)/(5) n$

Leaving you with.....

$-(3)/(5) = -(3)/(5) n$

Now, divide....

$(- (3)/(5) )/( -(3)/(5) ) = (- (3)/(5)n )/( -(3)/(5) )$

Making n=1

Thus, your answer.

Answer:

n = 1

Step-by-step explanation:

i just took the test

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