Southeastern Community College Mean, Standard Deviation, Random Variable & Probability Distribution Problem

Question Description

Section 6.1 #38

Compute the mean and standard deviation of the random variable with the given discrete probability distribution.

38.

x

P(x)

120

0.30

150

0.30

170

0.15

180

0.25

and

Section 6.2 #38a

38. Big babies: The Centers for Disease Control and Prevention reports that 25% of baby boys 6–8 months old in the United States weigh more than 20 pounds. A sample of 16 babies is studied.

a. What is the probability that exactly 5 of them weigh more than 20 pounds?

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