# Question

According to a recent report, people smile an average of μ = 62 time per day. Assuming that the distribution of smiles is approximately normal with a standard deviation of σ = 18, find each of the following values.

a. What proportion of people smile more than 80 times a day?

b. What proportion of people smile at least 50 times a day?

a. What proportion of people smile more than 80 times a day?

b. What proportion of people smile at least 50 times a day?

## Answer to relevant Questions

A recent newspaper article reported the results of a survey of well-educated suburban parents. The responses to one question indicated that by age 2, children were watching an average of μ = 60 minutes of television each ...Rochester, New York, averages μ = 21.9 inches of snow for the month of December. The distribution of snowfall amounts is approximately normal with a standard deviation of σ = 6.5 inches. This year, a local jewelry store is ...Find the z-score location of a vertical line that separates a normal distribution as described in each of the following. a. 5% in the tail on the left b. 30% in the tail on the right c. 65% in the body on the left d. 80% in ...A population of scores forms a normal distribution with a mean of µ = 80 and a standard deviation of σ = 10. a. What proportion of the scores have values between 75 and 85? b. For samples of n = 4, what proportion of the ...A population has a standard deviation of σ = 24. a. On average, how much difference should exist between the population mean and the sample mean for n = 4 scores randomly selected from the population? b. On average, how ...Post your question

0