The probability of a man hitting a target is 0.25. He shoots 7 times. What is the probability of his hitting at least twice?
Given that man shoots 7 times, so n=7
And probability of hitting target 
Where, 
∴P(X=r≥2) =1-[p(r=0) +P(r=1)]
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The probability of a man hitting a target is 0.25. He shoots 7 times. What is the probability of his hitting at least twice?
Given that man shoots 7 times, so n=7
And probability of hitting target
Where,
∴P(X=r≥2) =1-[p(r=0) +P(r=1)]