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The following frequency table gives the numbers of passengers using a bus service over a week long period. 5 ll 15 10 7 Frequency 3

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The following frequency table gives the numbers of passengers using a bus service over a week long period. 5 ll 15 10 7 Frequency 3 (a) Find the mean number of passengers carried per trip. (b) Find the population standard deviation of the number of passengers carried per trip

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