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The standard deviation of 32 numbers is ...

The standard deviation of 32 numbers is 5.If the sum of the numbers is 80,determine the sum of the squares of the numbers.

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UNITED BOOK HOUSE-ANNUAL EXAMINATION QUESTION PAPERS 2015-EXERCISE
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  2. Evaluate :lim(xrarry)(cos^2x-cos^2y)/(x^2-y^2)

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