Question

Find the z-score for a value of 30 if it comes from a sample with mean of μ = 20 and standard deviation of s = 3.5.

A) 2.86
B) 2.57
C) 1.71
D) 1.14

Answer 1

The z-score for a value of 30 is 2.86.

Step-by-step explanation:

To find the z-score for a value of 30, we can use the formula: z = (x - μ) / σ, where x is the value, μ is the mean, and σ is the standard deviation.

Substituting the given values, we have: z = (30 - 20) / 3.5 = 2.86.

Therefore, the z-score for a value of 30 is 2.86. The correct option is A) 2.86.