A survey of all medium and largesized corportions showed tha

A survey of all medium and large-sized corportions showed that 64% of them offer retirment plans to their employees. Let p^ be the proportion in a random sample of 50 such corportions that offer retirment plans their employees. Find the probabiltiy that the value of p^ will be

a) between 0.54 and 0.61 b) greater than 0.71

Also: 1) What distribution are you using for basis of probability calculations in the problem?