The Internal Revenue Service reports that the mean federal income tax paid in a recent year was $8040 with a standard deviation of $5000. The IRS takes a random sample of 100 tax returns and computes the sample mean federal income tax paid. What the probability this sample mean of 100 tax returns is less than $7500

Christine wong has asked dave and mike to her move into a new apartment on sunday morning. she has asked them both, in case one of them does not show up. from past experience, christine knows that there is a 40% chance that dave will not show up and a 30% chance that mik a. what is the probability that both dave and mike will show up? (round your answer to 2 decimal places.) b. what is the probability that at least one of them will show up? c. what is the probability that neither dave nor mike will show up? (round your answer to 2 decimal places.)e will not show up. dave and mike do not know each other and their decisions can be assumed to be independent.