A young investment manager tells his client that the probability of making a positive return with his suggested portfolio is 95%. If it is known that returns are normally distributed with a mean of 5.8%, what is the risk, measured by standard deviation, that this investment manager assumes in his calculation? Use Table 1. (Round “z” value to 2 decimal places and final answer to 3 decimal places.)

12.Fix-It Copiers advertises a mean time of 100 minutes for office calls with a standard deviation of 25 minutes. What percentage of calls are completed:a.between 100 and 120 minutes?b.in less than 120 minutes?c.in less than 60 minutes?d.between 120 and 150 minutes?

Tompkins Associates reports that the mean clear height for a Class A warehouse in the United States is 22 feet. Suppose clear heights are normally distributed and that the standard deviation is 4 feet. A Class A warehouse in the United States is randomly selected. (a) What is the probability that the clear height is greater than 16 feet? (b) What is the probability that the clear height is less than 11 feet? (c) What is the probability that the clear height is between 24 and 31 feet? (Round the values of z to 2 decimal places. Round your answers to 4 decimal […]

A politician is urging tighter restrictions on drivers’ licenses issued to teens. He claims that “in one of every five auto accidents a teenager is behind the wheel.” You decide to do a little research and find 67 records of car accidents over the past few months. Only nine of the accidents had a teenager behind the wheel. Assume that we can consider these 67 accidents as a random sample of all accidents. If the politician is correct, what is the chance that you would observe 9 or fewer accidents with a teenager behind the wheel?A.0.0524

Hi, I am really struggling on this AP Stats final exam…. Here are the questions I am struggling with: Consider the lengths of alligators to be { 18.7, 12.3, 18.6, 16.4, 15.7, 18.3, 15.8, 14.9, 17.6, 16.4, 16.7, 17.8, 16.2, 13.8, 15.2, 14.7, 13.2, 15.8, 14.6, 16.6, 16.2, 18.1, 17.5, 17.3 }. According to the Empirical Rule, 68% of the data should fall between what two numbers?