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A research team conducted a study showing that approximately 15% of all businessmen who wear ties wear them so tightly that they actually reduce blood flow to the brain, diminishing cerebral functions. At a board meeting of 20 businessmen, all of whom wear ties, what are the following probabilities? (Round your answers to three decimal places.)

Here n = 20, p =0.15, q = 1-p=1-0.15=0.85


(a)at least one tie is too tight…

(b) more than two ties are too tight…..

(c) no tie is too tight.

(d)at least 18 ties are not too tight…….