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(please make answer clear) Coronary bypass surgery: A healthcare research agency reported that 40% of people...

(please make answer clear)

Coronary bypass surgery: A healthcare research agency reported that 40% of people who had coronary bypass surgery in 2008 were over the age of 65. Eleven coronary bypass patients are sampled.

A.(a) What is the mean number of people over the age of 65 in a sample of 11 coronary bypass patients? Round the answer to two decimal places

The mean number of people over the age of 65is __??

B. (b) What is the standard deviation of the number of people over the age of 65 in a sample of 11 coronary bypass patients? Round the answer to four decimal places.

The standard deviation of the number of people over the age of 65 is_?
Math   Statistics-And-Probability   
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