Question: pls answer this 2 mc questions Multiple Choice Question An expert wishes to determine the average time (in seconds) required to drill holes in some

pls answer this 2 mc questions

Multiple Choice Question An expert wishes to determine the average time (in seconds) required to drill holes in some metal flange. Determine the required sample size to be 99% certain that the sample mean will be within 15 seconds of the true average, assuming that the standard deviation of the time is o = 30 seconds. A. 26 B. 27 C. 28 D. 29 E. none of the preceding Multiple Choice Question Suppose X is a random variable with probability mass function k if x = 0 f(x) = k if r = 1 14/25 if x = 3 Find k. A. 11/50 B. 11/25 C. 22/25 D. 22/50 E. none of the preceding

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