To determine the number of matches they contained.

The contents of 100 matchboxes were checked to determine the number of matches they contained

(i) Calculate, correct to one decimal place, the mean number of matches per box.
(ii) Determine how many extra matches would have to be added to the total contents of the 100 boxes to; bring the mean upto exactly 39 matches. (1997)

Solution:

Calculate the mean for the following distribution :

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Solution:

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