Respuesta :

12464280

Answer:

D.16

Step-by-step explanation:

 We know that the standard deviation is the square-root of variance. (+ve sqrt)

Therefore, the variance = (S.D)^2 = 16

And now..we go for the second question.............

The z score for a person with marks x is given by (x-mean)/(SD)

Putting in the known values,

Required z-score = (7-13)/4 = -6/4 = -1.5

lolacromwell7

Answer:The mean score on a physics test was 75 points. Amy’s score was 67 points, which was 2 standard deviations below the mean.

What is the variance of the data set?

2

4

8

16  <<<<<<<CORRECT

Step-by-step explanation:

EDGE 2021

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