Question

Find the mean of the following distribution:
0-25
25 - 40
Classes
40 - 55
55 - 70
70 - 85
85 - 100
3
7
6
6
6
​

Answer 1

Answer :-

class interval Fi Xi Fi*Xi

10 - 25 2 17.5 35

25 - 40 3 32.5 97.5

40 - 55 7 47.5 332.5

10 - 25 6 62.5 375

10 - 25 6 77.5 465

10 - 25 6 92.5 555

⅀Fi = 30 ⅀FiXi = 1860

so,

→ Mean = ⅀FiXi / ⅀Fi

→ Mean = 1860/30

→ Mean = 62 (Ans.)

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