MATH SOLVE

4 months ago

Q:
# The standard deviation of a data set is 4. What is the variance?a. 2b. 4c. 8d. 16

Accepted Solution

A:

Answer:D.16Step-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