The mean of the following data is 26.5 and the total frequency is 60
class 0-10 10-20 20-30 30-40 40-50
freq 6 x 17 y 8
Answers
Answer:
Given that mean of data is 42
sum of frequencies (N) or ∑f=100
Class interval 0−10 10−20 20−30 30−40 40−50 50−60 60−70 70−80
Frequency 7 10 x 13 y 10 14 9
Class interval frequency(fi) mid value of (xi) fixi
0−10 7 5 35
10−20 10 15 150
20−30 x 25 25x
30−40 13 35 455
40−50 y 45 45y
50−60 10 55 550
60−70 14 65 910
70−80 9 75 675
___________ ______________
63+x+y 2775+25x+45y
Given N=100
⇒63+x+y=100
x+