Assume that the red blood cell counts of women are normally distributed with a mean of 4.577 million cells per microliter and a standard deviation of 0.382 million cells per microliter. Approximately what percentage of
Women have red blood cell counts in the normal range from 4.2 to 5.4 million cells per microliter?

Question

Quizplus · Accepted Answer

To find the percentage of women with red blood cell counts in the normal range from 4.2 to 5.4 million cells per microliter, we need to find the z-scores for both values and use the standard normal distribution table.

Z-score for 4.2: (4.2 - 4.577) / 0.382 = -0.981
Z-score for 5.4: (5.4 - 4.577) / 0.382 = 2.160

Using the standard normal distribution table, we find that the percentage of women with red blood cell counts between these two z-scores is approximately 82.31%. Therefore, the best choice is B.

Assume That the Red Blood Cell Counts of Women Are