theory: since every time prob of success is same n all events r independent it clearly indicates that we shud go for binomial trials thus
p[x>=3]
p3 + p4 + p5
so
3 times hit:
5C3*(3/4)3(1/4)2
4 times hit:
5C4*(3/4)4(1/4)1
5 times hit:
(3/4)5
addding all these we get required P
P=5C3*(3/4)3(1/4)2+5C4*(3/4)4(1/4)1+(3/4)5
hope its one of the best ans
plz rate for my efforts
cheers!!!!!!
Moderation Team
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