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Arithmetic Mean and Range

If number 4 a...

Question

If number 4 and 9 have frequencies x and (x-1) respectively . if their arithmetic mean is 6 , then x is equal to what?

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Solution

4 have frequency x and 9 have frequency (x-1) then the sum is 4x+9×(x-1) given their mean =6 {4x+9×(x-1)}/2=6 solving this we get x=21/13

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