The distribution of scores on a test is mound-shaped and symmetric with a mean score of 78. If 68% of the scores fall between 72 and 84, which is most likely to be the standard deviation of the distribution?

The standard deviation for the distribution of scores is 6.    

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 78

We are given that the distribution of score is a bell shaped distribution that is a normal distribution.

Empirical Formula:

68% of the scores fall between 72 and 84, thus, we can write:

Thus, the standard deviation for the distribution of scores is 6.

my guess would be b and d, but i didn’t actually get out the pen and paper. lol

y = 3x+4

step-by-step explanation:

to find the slope

slope = (y2-y1)/ (x2-x1)

    = (-8-4)/ (-4-0)

    = -12/-4

  = 3

using the slope intercept form of a line

y= mx+b

we know the slope is 3

we know the y intercept is 4 ( the point where it crosses the y axis or x=0)

y = 3x+4