What is the mean frequency distribution of series I ........

Quantitative Aptitude (CDS) Average

Direction for the following two(02) items:
Read the following frequency distribution for two series of observations and answer the two items that follow:

Class interval	Frequency
	Series-I	Series-II
10-20	20	4
20-30	15	8
30-40	10	4
40-50	x	2x
50-60	y	y
Total	100	100

What is the mean frequency distribution of series-I ?

33.6

35.6

37.6

39.6

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Explanation:

x + y = 100- (20+15+10)=55
2x +y =100- (4+8+4)=84
=>x=29 and y=26
Mean of the frequency distribution of the series I= $\frac{(15\times 20)+(25\times 15)+(35\times 10)+(45\times 29)+(55\times 26)}{100}$ =3760/100=37.6