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Second Exam Review Class

# Second Exam Review Class - Second Exam Review Class 1 A...

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Second Exam Review Class 1. A recent newspaper article reported the results of a survey of well-educated suburban parents. The responses to one question indicated that by age two, children were watching an average of mu = 60 minutes of television each day. Assuming the distribution of television-watching times is normal with a standard deviation of sigma = 20 minutes fine each of the following probabilities: a. What is the probability of 2 year old children watching more than 90 minutes of television each day? b. What is the probability of 2 year old children watching 20 minutes of television or less?

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2. The physical fitness of a patient is often measured by the patient’s maximum oxygen uptake. The mean maximum oxygen intake for cardiac patients who regularly participate in sports or exercise was found to be 24.1 with a standard deviation of 6.30. Assume this distribution is approximately normal. a. What is the probability that a cardiac patient who regularly participates in sports has a maximum oxygen uptake of 20 or higher? b. What is the probability that a cardiac patient who regularly exercises has a maximum oxygen uptake of 10.5 or lower.
3. A consumer survey indicates that the average household spends mu= \$185.00 on groceries each week. The distribution of spending amounts is approximately normal with a standard deviation sigma - \$25.00. a. What proportion of the population spends more than \$200.00 a week on groceries? b. What is the probability of randomly selecting a family that spends less than \$150.00 per week on groceries? c. How much money do you need to spend on groceries each week to be in the top 20% of the distribution?

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