Data Set 7-5: Suppose you knew that a population had a mean of 150 and a standard deviation of 50.
-Use Table C and Data Set 7-5. The proportion of the population with scores less than 0 is
A) .0000
B) .9987
C) .4987
D) .0013

Question

Quizplus · Accepted Answer

To find the proportion of the population with scores less than 0, we need to calculate the z-score for 0 using the formula z = (X - μ) / σ, where X is the score, μ is the mean, and σ is the standard deviation. Here, z = (0 - 150) / 50 = -3. Using the standard normal distribution table (Table C), a z-score of -3 corresponds to a proportion of 0.0013.

Data Set 7-5: Suppose You Knew That a Population Had