Question

Find the Z-score for the value 55, when the mean is 98 and the standard deviation is 5.Pick a choice A. Z= -8.60 B. z= -8.80 C. z= -0.51 D. z=0.51

Answer 1

The formula for calculating z score is expressed as

z = (x - μ)/σ

where

x represents sample mean

μ represents population mean

σ represents population standard deviation

From the information given,

x = 55

μ = 98

σ = 5

By substituting these values into the formula,

z = (55 - 98)/5 = - 43/5

z = - 8.6