Question

find the mean of 15 to 20 ,20 to 25 25 to 30 30 to 35 35 to 40​

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10th

Maths

Statistics

Mean of Grouped Data

Calculate the mean for the ...

STATISTICS

Asked on December 27, 2019 bySanjitha Chaitanya

Calculate the mean for the following data using step deviation method:

Class interval (X)

0-10

10-20

20-30

30-40

40-50

50-60

60-70

Frequency

15

10

15

20

25

30

35

Round off your answer to the nearest whole number.

A

41

B

42

C

43

D

44

MEDIUM

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ANSWER

Consider the following table, to calculate mean by "step deviation method":

xi=mid value of class interval

Assumed mean a=35

class interval c=10

 ci fi xi di=cxi−a  fidi 0−10 15 5 −3 −45 10−20 10 15 −2 −20 20−30 15 25 −1 −15 30−40 20 35 0 0 40−50 25 45 1 25 5