Q4. The owner of a bowling alley determined that the average weight for a bowling ball is 12 pounds with a standard deviation of 1.5 pounds. A ball denoted “heavy” should be one of the top 2% based on weight. Assuming the weights of bowling balls are normally distributed, at what weight (in pounds) should the “heavy” designation be used? A) 15.08 pounds.
B) 14.22 pounds.
C) 14.00 pounds.
Q5. Which of the following represents the mean, standard deviation, and variance of a standard normal distribution? A) 0, 1, 1. B) 1, 1, 1. C) 1, 2, 4.
Q6. Standardizing a normally distributed random variable requires the: A) mean, variance and skewness. B) mean and the standard deviation. C) natural logarithm of X.
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发表于 2009-1-9 10:33
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