Question

Probability of raining on any day in certain
week is 50%. What is the probability that it
rains eractly 3 days in a span of 5 days?
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Answer 1

use binomial distribution for such kind of questions.

p= prob of rain = 1/2

q= prob of no rain = 1/2

n=5 and r=3 as we want 3 days of rain out of 5 days

use formula.

nCr * p^r * q^(n-r)

[(5*4*3)/(3*2*1)] * 1/32= 10/32 = 5/16

hope you can relate such questions with formula.

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