Standard Deviation Day 2

Question

The mean for your data set is 13. The standard deviation is 2.5. What is the z-score for 10? Note 1: If necessary, round your answer to 3 decimal places (3 digits to the right of the decimal point).

Answer 1

z = (x - µ)/σ = (10 - 13/(2.5) = - 1.200

Answer 2

(x-µ)/σ

(10 - 13) / 2.5