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NCERT Textbook
STATISTICS

Class 11
Maths :-NCERT Solutions - Statistics

Page No 371:
Question 5:
Find the mean and variance for the data

xi

92

93

97

98

102

104

109

f i

3

2

3

2

6

3

3





Answer:

The data is obtained in tabular form as follows.

xi

f i

fixi

92

3

276

–8

64

192

93

2

186

–7

49

98

97

3

291

–3

9

27

98

2

196

–2

4

8

102

6

612

2

4

24

104

3

312

4

16

48

109

3

327

9

81

243

22

2200

640

Here, N = 22, 


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NCERT Maths Class 11

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