Amy surveyed the prices for a quart of a certain brand of motor oil.
Amy surveyed the prices for a quart of a certain brand of motor oil. The sample data, in dollars per quart, is summarized in the table below.
| Price per Quort (dollars) | Number of Stores |
|---|---|
| 1.99 | 3 |
| 2.09 | 5 |
| 2.19 | 11 |
| 2.29 | 13 |
| 2.39 | 8 |
| 2.49 | 2 |
(a) Find the mean and the standard deviation of the prices. (Round your answers to three decimal places.)
(b) What percent of the data lies within one standard deviation of the mean? (Round your answer to the nearest whole number.)
(c) What percent of the data lles within two standard deviations of the mean? (Round your answer to the nearest whole number.)
(d) What percent of the data lies within three standard deviations of the mean? (Round your answer to the nearest whole number.)
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Amy surveyed the prices for a quart of a certain brand of motor oil.
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Show brief calculation for #13
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