Standard Deviation Day 2

Question

The mean for your data set is 24. The standard deviation is 4.2. What is the z-score for 18? 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 = (18 - 24)/(4.2) = - 1.429

Answer 2

The formula is (x-µ)/σ

(18 - 24) / 4.2