Question

A scientist calculated the mean and standard deviation of a data set to be mean = 120 and standard deviation = 9. She then found that she was missing one data value from the set. She knows that the missing data value was exactly 3 standard deviations away from the mean. What was the missing data value?

A. 129
B. 147
C. 360
D. 369

Answer 1

Answer: B on edg

Explanation:

Answer 2

The missing data value is 147

Explanation:

If a point lies 3 standard deviations away from the mean, then the data point can be determined by simplifying the expression; μ±3σ. Where μ is the mean and σ the standard deviation. In this case this would be; 120±3(9)