he heights of European 13-year-old boys can be approximated by a normal model with mean ? of 63.7 inches and standard deviation ? of 2.53 inches.  a) A random sample of 4 European 13-year-old boys is selected. What is the probability that the sample mean height x is greater than 65.6 inches? (use 4 decimal places in your answer) b) A random sample of 9 European 13-year-old boys is selected. What is the probability that the sample mean height x is greater than 65.6 inches?

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