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Question -

Find the mean deviation about the mean for the data in Exercises 9 and 10.

Height in cms

95 – 105

105 – 115

115 – 125

125 – 135

135 – 145

145 – 155

Number of boys

9

13

26

30

12

10



Answer -

Let us make the tableof the given data and append other columns after calculations.

Height in cms

Number of boys fi

Mid – points

xi

fixi

|xi – x̅|

fi|xi – x̅|

95 – 105

9

100

900

25.3

227.7

105 – 115

13

110

1430

15.3

198.9

115 – 125

26

120

3120

5.3

137.8

125 – 135

30

130

3900

4.7

141

135 – 145

12

140

1680

14.7

176.4

145 – 155

10

150

1500

24.7

247

100

12530

1128.8

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