Question

1. Five percent of the grocery bills at the grocery store are incorrect. If a sample of 20 grocery bills from the grocery store are the be selected at random:
   1. What is the probability that exactly two of the bills are incorrect?
   2. How many incorrect bills are expected from the sample of 20 bills?
   3. Compute the variance and standard deviation of the number of incorrect bills?

2. The height distribution among American adult males has a mean of 70 inches with a standard deviation of 3 inches.
   1. What percentage of males are 72 inches or taller?
   2. In 2003, the US Food and Drug Administration approved HGH treatment for males 2.25 standard deviations below the population mean. What percentage of the male population should be treated?
   3. Gigantism affects the tallest 1% of the American male population. How tall does a man have to be in order to have that condition?

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Answer 1