Exam2_practice1

# Exam2_practice1 - 5E practice problems for exam 2 1 Use the...

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Unformatted text preview: 5E practice problems for exam 2 1. Use the normal approximation to the binomial distribution to find the probability that out of 600 rolls of a fair, six-sided die at most 80 of them are ones. What is the probability that at least 120 of them are ones? What is the probability that at least 110 are ones? 2. Suppose that the amount customers spend at a grocery store is normally distributed with a mean of \$22 and a standard deviation of \$8. We plan to randomly select 5 people walking out of the store and check how much they spent. • What is the probability that the mean amount spent by the 5 people will be less than \$19? • What is the probability that the mean amount spent by the 5 people will be between \$19 and \$25? • What is number E so that we have a 98% chance that the mean for the 5 will be within E of \$22? • Is our sample size large enough that we can expect our answers to the above are accurate?...
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