The research team performed the study showing that about 20% of all businessmen who wear ties wear them so tightly that they really decrease blood flow to brain, diminishing cerebral functions. At the board meeting of 15 businessmen, all of whom wear ties, Find given probabilities?
i) more than two ties are too tight?
ii) at least 13 ties are not too tight?
iii)at least one tie is too tight?
iv) no tie is too tight?