6. The IRS claims that the mean wait time for callers during tax season was at most 7 minutes. A random sample of 11 callers has a mean wait time of 8.7 minutes and a
standard deviation of 2.7 minutes. Is there enough evidence to reject the claim at a
significance level of 0.10?

Exclude leap years from the following calculations. (a) compute the probability that a randomly selected person does not have a birthday on october 4. (type an integer or a decimal rounded to three decimal places as needed.) (b) compute the probability that a randomly selected person does not have a birthday on the 1st day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (c) compute the probability that a randomly selected person does not have a birthday on the 30th day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (d) compute the probability that a randomly selected person was not born in january. (type an integer or a decimal rounded to three decimal places as needed.)