Find the arithmetic mean of the given data.

X	10	20	30	40	50
F	5	5	4	6	5

Correct option is C

Given:

$F$ = (5, 5, 4, 6, 5).

Formula used:

​$$Mean = \frac{Σ(X × F)}{ΣF}$$ 

Solution:

∑(X×F) = 50 + 100 + 120 + 240 + 250 = 760

∑F  =  5 + 5 + 4 + 6 + 5 = 25

Mean = $$\frac{760}{25}$$ = 30.4

Thus the correct answer is (C)