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If the mean and variance of observations 4, 5, 6, 6, 7, 8, x, y where x<y are 6 and 9/4 respectively, then 4 the value of x^4 + y^2 is

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If the mean and variance of observations 4, 5, 6, 6, 7, 8, x, y where x<y are 6 and 9/4 respectively, then 4 the value of x4 + y2 is

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from (1) and (2) x = 4 , y = 8

x4 + y2 = 256 + 64 = 320

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