The pulse rates of 167 randomly selected adult males vary from a low of 41 bpm to a high of 101 bpm. Find the minimum sample size required to estimate the mean pulse rate of adult males. Assume that we want 98​% confidence that the sample mean is within 4 bpm of the population mean. a. Find the sample size using the range rule of thumb to estimate sigma. n equals ​(Round up to the nearest whole number as​ needed.)   b. Assume that sigma equals 10.9 ​bpm, based on the value s equals 10.9 bpm from the sample of 167 male pulse rates. n equals ​(Round up to the nearest whole number as​ needed.)

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