Mean Deviation about Mean
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Find the mean deviation about the mean for the given data.
xi 5 10 15 20 25 fi 7 4 6 3 5
Find the mean deviation about the mean for the following data.
xi 10 30 50 70 90 fi 4 24 28 16 8
Find the mean, variance and standard deviation using short-cut method
Height in cm70−7575−8080−8585−9090−9595−100100−105105−110110−115No. of children3477159663
- 64.25
- 54.25
- 70.25
- 74.25
For the given distinct values x1, x2, x3, .....xn occurring with frequencies f1, f2, f3, ...fn respectively. The mean deviation about mean where ¯x is the mean and N is total number of observations would be
1Nn∑i=1fi |xi−M|
1Nn∑i=1fi|xi−¯x|
n∑i=1|xi−¯x|N
N⋅fin∑i=1|xi−¯x|