The frequency distribution of 205 observations on X is given below: X: 3, 5, 6, 7 with frequencies f, f+2, f−3, f+6 respectively. What is the mean of the frequency distribution?
A.3·29
B.4·29
C.5·29✓ Correct
D.6·29
Explanation
With f = 50: frequencies are 50, 52, 47, 56. Σfx = 3(50) + 5(52) + 6(47) + 7(56) = 150 + 260 + 282 + 392 = 1084. Mean = 1084/205 ≈ 5.29.
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