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13. Given the following tables. For each, show use of formula to estimate the mean. Round the final answer to one decimal place, if necessary.

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13. Given the following tables. For each, show use of formula to estimate the mean. Round the final answer to one decimal place, if necessary. Find the mode or modal class. Find the sample standard deviation for each on calculator. Value Frequency Value Interval Frequency 15 0-3 12 4-7 6 8-11 11 12-15 10

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