to A store owner observed that 66% of his customers were over the age of 65-117

Question

to A store owner observed that 66% of his customers were over the age of 65-117 customers visit the store in an hour, what is the mean and standard deviation of the number of customers that are over the age of 65? O Mean 2.38, Standard Deviation-1.571 Mean4.62, Standard Deviation 1.253 Mean4.62, Standard Deviation 1.571 O Mean 1.253, Standard Deviation 4.62 QUESTION 5 2 p A store owner observed that 66% of his customers were over the age of 65, what is the probability that if 7 customers visit her store in one hour, 5 of them are over the age of 65? 749 304 190 .696

Explanation / Answer

We use binomial distribution formula

n=7

r=5

p=0.66

q=1-p=1-0.66 =0.34

P=nCr p^r q^(n-r)

=7C5 (0.66)^5 (0.34)^(7-5)

=21 * (0.66)^5 (0.34)^2

=0.304

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