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Find the mean deviation about the mean for the following data : Height in (cm) - 95-105, 105-115, 115-123, 125-135

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Find the mean deviation about the mean for the following data :

Height (in cm) 95-105 105-115 115 - 125 125 - 135 135-145 145-155
Number of boys 9 16 23 30 12 10
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we make the following table from the given data:

Height (in cm) Number of boys
fi		 Mid-points
xi		 fixi
95 - 105 9 900
105 - 115 16 1760
115 - 125 23 2760
125 - 135 30 3900
135 - 145 12 1680
145 - 155 10 1500
100 12500

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