2 Section 6.1 #38 & Section 6.2 #38a
38. Compute the mean and standard deviation of the random variable with the given discrete probability distribution.
X
120
150
170
180
P(x)
0.30
0.30
0.15
0.25
38a. 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. What is the probability that exactly 5 of them weigh more than 20 pounds?
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