Latest TCS Aptitude Question SOLUTION: if the probability of rain on any given day in pune city is 50% then what is the probability that it rains on exactly 3 days in a 5 day period?

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if the probability of rain on any given day in pune city is 50% then what is the probability that it rains on exactly 3 days in a 5 day period?

Asked In TCS Ragini (13 years ago)

Solved subhojit som Read Solution (8)

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Read Solution (8) :

subhojit som  (13 years ago)

5c3*(1/2)^5 = 10/32(selection of 3 days from 5 =5C3; probability of rainfall on each day = 1/2 => ans:5C3*(1/2)^5 )

Is this solution Helpfull? Yes (85) | No (10)  

Joy  (13 years ago)

probability it rains on 1st day=1/2
probability it rains on 2nd day=1/2
probability it rains on 3rd day=1/2
probability it rains on 4th day=1/2
probability it rains on 5th day=1/2
Probability of rain in any day of 5day period=1/32
probability that it rains on exactly 3 days in a 5 day period=5c3*(1/32)=10/32=5/16

Is this solution Helpfull? Yes (41) | No (1)  

kuhel chowdhury  (13 years ago)

subhojit great..............the persons who are talking that ur ans is wrong are simply called donkey

Is this solution Helpfull? Yes (11) | No (7)  

@SI-IW@NI 12U13EY  (12 years ago)

since for probability for the rain in on day is=>>1/2
so for 5 days it would be=>>(1/2)^5=1/32
but we have to find the probability when it rains exactly on three days in 5 days
so,req. probability is=5C3*(1/32)
=10/32
=5/16

Is this solution Helpfull? Yes (7) | No (1)  

rohit verma  (13 years ago)

5c3*(1/2)^3 bcoz rain occurs in only 3 days...

Is this solution Helpfull? Yes (5) | No (3)  

Pavan Kumar  (7 years ago)

Garapati anusha devi, probability can never be greater than 1. That's the very basic thing you missed to notice.

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GARAPATI ANUSHA DEVI  (8 years ago)

ANS:5/4
In 5 days we can have rain fall in any 3 days.
for choosing that 3 days= 5c3=10
in that 3 days we have half of chances to get rain fall.(1/2)^3
so ans 10*(1/8)=5/4.

Is this solution Helpfull? Yes | No (4)  

sweety  (5 years ago)

5/16
,i got

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