For women aged 18-24, systolic blood pressures are normally distributed with a mean of 114.8 mm Hg and a standard deviation of 13.1 mm Hg. If 23 women aged 18-24 are randomly selected, find the probability that
Their mean systolic blood pressure is between 119 and 122 mm Hg.

Question

Quizplus · Accepted Answer

The standard error of the mean is calculated as the standard deviation divided by the square root of the sample size. Using this, the z-scores for 119 and 122 are calculated and the probability between these z-scores is found using the standard normal distribution table.

For Women Aged 18-24, Systolic Blood Pressures Are Normally Distributed