5. The probability that a woman does not know swimming is 2/5. If seven women in a city are
selected at random, find probability that
(i) four women know swimming.
(ii) at least one woman knows swimming
Let "X=" the number of female who knows swimming : "X\\sim Bin (n, p)."
Given "n=7, q=2\/5=0.4, p=1-q=0.6."
(i)
(ii)
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