Which of the following is NOT a requirement for testing a claim about a population mean with sigmaσ known? Choose the correct answer below. A. The value of the population standard deviation is known. B. Either the population is normally distributed or ngreater than>30 or both. C. The sample mean, x overbarx is greater than 30. D. The sample is a simple random sample.

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.

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.