Given the proper treatment, small puncture wounds have a healing time that is normally distributed with a mean of 115.5 hours and a standard deviation of 12.1 hours. If a randomly selected soldier is given this treatment by a medic as soon as he experiences a small puncture wound, what is the probability that it will take more than 100 hours to heal?

The patient recovery time from a particular surgical procedure was normally distributed with a mean of 5.6 days and a standard deviation of 2.1 days.  What is the probability of spending more than three days in recovery? The 90th percentile for recovery time is?

The patient recovery time from a particular surgical procedure is normally distributed with mean of 5.5 days and a standard deviation of 1.7 days. What is probability of spending morethan4 days in recovery?

TREKLAIR bulbs have an average lifespan of800 hours with a variance of 1,600 hours2 .This duration oflife has a normal distribution. Find the probability that abulb lasts between 778 and 834 hours.

Bone mineral density (BMD) is a measure of bone strength. Studies show that BMD declines after age 45. The impact of exercise may increase BMD. A random sample of 59 women between the ages of 41 and 45 with no major health problems were studied. The women were classified into one of two groups based upon their level of exercise activity: walking women and sedentary women. The 39 women who walked regularly had a mean BMD of 5.96 with a standard deviation of 1.22. The 20 women who are sedentary had a mean BMD of 4.41 with a standard deviation of 1.02. Which of the following inference procedures could be used to estimate the difference in the mean BMD for these two types of women

Assuming cholestorol data indicated a mean total cholesterol level for adult persons 20 years of age and older in the United States was 190 mg/dl; with a known standard deviation of 30 mg/dl. Use a known standard deviation of 30 mg/dl and the underlying population is normally distributed. What is the probability that a randomly selected adult, ≥ 20 years of age will have a cholesterol level < 180 mg/dl?

The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an average (mean) of 1.8 pounds with a standard deviation of 0.95 pounds. In a recent study, a group of 45 people who used this pill were interviewed. The study revealed that these people lost a mean of 1.92 pounds after one week. If the producer's claim is correct, what is the probability that the mean weight loss after one week on this pill for a random sample of 45 individuals will be 1.92 pounds or less? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.

A report on egg consumption shows that people living in China eat an average of 196 eggs each year with a standard deviation of 18.3 eggs.  If a group of 81 Chinese people are selected at random, what is the probability that the average egg consumption of this group will be more than 200 eggs?

The life span of a machine in a factory is normally distributed with a mean of 10.2 years and a standard deviation of 1.7 years. What is the probability that a randomly selected machine will last between 11 and 13 years.