The average time for a student to complete this quiz is 24 minutes with a standard deviation of 2 minutes. What is the range of minutes needed for the middle 68% of quiz times? Complete the

sentence below.

The middle 68% of all people finish the quiz somewhere between

and

minutes.

22 and 26 minutes

Step-by-step explanation:

Given that :

Mean, m = 24

Standard deviation, s = 2

The Zscore representing the middle 68% falls within 1 standard deviation of the mean ;

68% : (-1 < z < 1)

From the Z standardization equation ;

Z = (x - m) / s

Zs = x - m

x = Zs + m

For Z = - 1 ; x = (-1*2 + 24) = - 2 + 24 = 22

For Z = 1 ; x = (1*2 + 24) = 2 + 24 = 26

The middle 68% of all people finish the quiz somewhere between 22 and 26 minutes

the correct answer is option c.   3

step-by-step explanation:

points to remember

equation of the line with coordinates (x₁, y₁) and (x₂, y₂) is given by,

slope m = (y₂ - y₁)/(x₂ - x₁)

from the figure we can see a line with two coordinates given

to find the slope of given line

here   (x₁, y₁)   = (-1, -1 ) and (x₂, y₂) = (1, 5)

slope m = (y₂ - y₁)/(x₂ - x₁)

  = (5 - -1)/(1 - -1)

  = (5 + 1)/(1 + 1)

  = 6/2 = 3

therefore the correct answer is option c.   3

step-by-step explanation: