In Exercises 69 and 70, determine whether you can use a normal distribution to
Chapter 5, Problem 70(choose chapter or problem)
In Exercises 69 and 70, determine whether you can use a normal distribution to approximate the binomial distribution. If you can, use the normal distribution to approximate the indicated probabilities and sketch their graphs. If you cannot, explain why and use a binomial distribution to find the indicated probabilities. Thirty-one percent of people in the United States have type A+ blood. Yourandomly select 40 people in the United States and ask them whether their bloodtype is A+. Find the probability that the number of people who have A+ blood is(a) exactly 15, (b) less than 10, and (c) between 20 and 35, and (d) identify anyunusual events. Explain. (Source: American Association of Blood Banks)
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