QuestionThe pulse rates of 176 randomly selected adult males vary from a low of 39 bpm to a high of 111 bpm . Find the minimum sample size required to estimate the mean pulse rate of adult males. Assume that we want $95 \%$ confidence that the sample mean is within 4 bpm of the population mean. Complete parts (a) through (c) below. a. Find the sample size using the range rule of thumb to estimate $\sigma$. $n=$ $\square$ (Round up to the nearest whole number as needed.)