A normal population has a mean $\mu = 28$ and standard deviation $\sigma = 5$. What proportion of the population is less than 23 ?
A) 1.0000
B) 0.7389
C) 0.1587
D) 0.8413

Question

Quizplus · Accepted Answer

To find the proportion of the population less than 23, we calculate the z-score: $ z = \frac{23 - 28}{5} = -1 $. Using the standard normal distribution table, the proportion corresponding to a z-score of -1 is approximately 0.1587.

A Normal Population Has a Mean μ=28\mu = 28μ=28 And Standard Deviation

A Normal Population Has a Mean $\mu = 28$ And Standard Deviation