SOLUTION: Costumers in a department store are normally distributed with a mean age of 32.3 years and a standard deviation of 9.7 years. b) What is the probability that 2 of the next 3 cus

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Question 876253: Costumers in a department store are normally distributed with a mean age of 32.3 years and a standard deviation of 9.7 years.
b) What is the probability that 2 of the next 3 customers will be in their twenties? (2)

Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 
Hi
P(20 ≤ x ≤ 29 ) = P( -1.268 ≤ z ≤ -.340)
= P( z ≤ -.340) -P(z ≤ -1.268)
= .3669 - .1024 = .2645
n = 3
b) P(2) = 3C2(.2645)^2(.7355)^1
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