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Table below shows the frequency f with w...

Table below shows the frequency `f` with which `x` alpha particles were radiated from a diskette `x :` 0 1 2 3 4 5 6 7 8 9 10 11 12 `f:` 51 203 383 25 532 408 273 139 43 27 10 4 2 Calculate the mean and variance

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