Question 1 Report
If the mean of the above frequency distribution is 5.2, find y
Answer Details
Mean ¯x x ¯ = ∑fx∑f ∑ f x ∑ f = 5.21 5.2 1 = 8+4y+36+404+y+6+5 8 + 4 y + 36 + 40 4 + y + 6 + 5 = 5.21 5.2 1 = 84+4y15+y 84 + 4 y 15 + y = 5.2(15 + y) = 84 + 4y = 5.2 x 15 + 5.2y = 84 + 4y = 78 + 5.2y = 84 = 4y = 5.2y - 4y = 84 - 78 1.2y = 6 y = 61.2 6 1.2 = 6012 60 12 = 5
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