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13-02-2024
Mathematics

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The table below gives the distribution of the number of letters in the first fifty words of an essay
Number of letters 1 2 3 4 5 6 7 8 9
Number of words 1 3 x 10 12 y 6 4 1
(b) Calculate, correct to two decimal places, the standard deviation of the distribution.
(a) If the average number of letters per word is 5 find the value of x and y

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