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In comparing a breakup and a surface count of the number of choc chips in a cookie, a researcher takes four cookies of one type and records the following data:
Biscuit number | 1 | 2 | 3 | 4 |
Surface count | 10 | 12 | 11 | 12 |
Breakup count | 12 | 13 | 14 | 14 |
Find the mean of the difference (breakup count - surface count), correct to two decimal places.
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