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Vaibhav Mathur Grade: 12
        

A man firing at a distant target has 10% chance of hitting the taget in one shot.The number of times he must fire at the target to have about 50%chance of hitting the target is


a. 11


b.9


c. 7d. 5

7 years ago

Answers : (1)

Ramesh V
70 Points
										

prob of hitting target is 1/10


loosing target is 9/10


so in order to succed in nth shot, he has to fail in (n-1) shots and succed in nth shot


so , here (9/10)(n-1)*(1/10) = (1/2)


on solving n comes nearly to 7 where chace of hitting is arnd 53%


so, n = 7


--


regards




Ramesh

7 years ago
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