c) solution:-
given that n = 50 , p = 79% = 0.79
mean = n * p = 50 * 0.79 = 39.5
---------------------------------
d) solution:-
given that n = 50 , p = 79% = 0.79
standard deviation = sqrt(n*p*(1-p))
= sqrt(50*0.79*(1-0.79))
= 2.8801
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