Sum of 8 observation is p2+31p if mean is 4 find p
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Sum of 8 observations = p²+31p
No.of observations = 8
Mean = sum of observations/no.of observations
4 = p²+31p/8
p²+31p = 4×8
p²+31p = 32
p²+31p - 32 = 0
p² - p + 32p - 32 = 0
p(p-1) + 32(p-1) = 0
(p-1) (p+32) = 0
p-1 = 0 ; p=1
p+32 = 0 ; p= -32
p can not be negative so the value of p = 1
No.of observations = 8
Mean = sum of observations/no.of observations
4 = p²+31p/8
p²+31p = 4×8
p²+31p = 32
p²+31p - 32 = 0
p² - p + 32p - 32 = 0
p(p-1) + 32(p-1) = 0
(p-1) (p+32) = 0
p-1 = 0 ; p=1
p+32 = 0 ; p= -32
p can not be negative so the value of p = 1
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