Question

17. The probability that a man can hit a target is
He tries 5 times. The probability that he will hit
the target atleast three times is
(a) 291/364
(b) 371/464
(c) 471/502
(d) 459/512
​

Answer 1

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Required Probability

Given, n = 5 and r = 3

Then, Success P = 3/4

Failure, q = 1 - 3/4 = 1/4

Man hit the target thrice

= 5c3 (3/4)3 (1/4)2 + 5c4 (3/4)3 (1/4) + 5c3(3/4)5

= (270/1024) + (405/1024) + (243/1024)

= 918/1024

= 459/512

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Answer 2

hi zia

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