Question

A missing data value from a set of data has a z-score of -2.1. Fred already calculated the mean and standard deviation to be

#= 43 and 0-2. What was the missing data value? Round the answer to the nearest whole number.
39
41
45
47

Answer 1

Answer: 39

Step-by-step explanation: I got it correct.

Answer 2

39

Explanation:

Data

• mean = 43

• standard deviation (sd) = 2

The z-score is computed as follows:

z = (x - mean)/sd

where x is a value of interest, in this case, the missing data value. Replacing with data and solving for x:

-2.1 = (x - 43)/2

-2.1*2 + 43 = x

39 = x