QUESTION 1 I. The masses, to the nearest gram (g), of a random sample of 100 letters passing through Montego Bay Post Office No. 1 are in the table below. Mass (g) 40-59 60-69 70-79 80-89 90-99 100-149 150-159 Number of 10 25 46 4 letters Calculate to two decimal places: a) the mean b) the standard deviation

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