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A student calculated the mean of a set of 15 numbers and gets a result of 41.6. In calculating the mean, he inadvertently entered 117 for one of the numbers into his calculator instead of 17. What is the true mean of the data?

Waiting times​ (in minutes) of customers at a bank where all customers enter a single waiting line and a bank where customers wait in individual lines at three different teller windows are listed below. Find the coefficient of variation for each of the two sets of​ data, then compare the variation. Bank A​ (single line): 6.4

A recent study reported that the prevalence of hyperlipidemia (defined as total cholesterol over 200) is 30% in children 2-6 years of age. If 12 children are analyzed, A.   What is the probability that at least 3 are hyperlipidemic? B.   What is the probability that 3 are hyperlipidemic? C.   How many would be expected to meet the criteria for hyperlipidemia?

given that X is a normal variable, which of the following statements is/are true: a. the variable X+3 is also normally distributed b. the variable X-2 is also normally distributed c. the variable 5X is also naormally distribued d. all of the above are true e none of the above are true

(a) Explain briefly and in nontechnical language what “a significant difference (P < 0.01)” means. (b) Explain clearly and briefly what “95% confidence” means. (c) Is this study good evidence that requiring job training of all welfare mothers would greatly reduce the percent who remain on welfare for several years?