An Official from the Australian Securities and Investments Commission Estimates

Short Answer

An official from the Australian Securities and Investments Commission estimates that 75% of all investment bankers have profited from the use of insider information. If 15 investment bankers are selected at random from the Commission's registry, find the probability that:
a. at most 10 have profited from insider information.
b. at least six have profited from insider information.
c. all 15 have profited from insider information.