12 May 1.The distribution of the annual incomes
| 1. | The distribution of the annual incomes of foremen at the Marvin Window Company approximated a normal distribution with a mean of $37,200 and a standard deviation of $800. About 68% of the incomes lie between what two incomes? |
| 2. | Which of the following is true in a normal distribution?
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| 3. | Tables of normal distribution probabilities are found in many statistics books. These probabilities are calculated from a normal distribution with ___________.
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| 4. | Two normal distributions are compared. One has a mean of 10 and a standard deviation of 10. The second normal distribution has a mean of 10 and a standard deviation of 2. Which of the following is true?
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| 5. | A normally distributed random variable has _________.
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| 6. | The total area of a normal probability distribution is _______.
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| 7. | In an illustration of a normal probability distribution, a shaded area represents _______.
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| 8. | The standard normal probability distribution is unique because it has _________.
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| 9. | The weekly mean income of a group of carpenters is $1,000 and the standard deviation of this group is $100. The distribution is normal. What percent of the carpenters have an income of $925 or less? |
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