Find the mean using direct method
Class. Frequency
0-10. 8
10-20. 16
20-30. 36
30-40. 34
40-50. 6
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Thus,the mean is 26.4 ...
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class 0- 10 class mark=5
10-20.............................==15
20-30...........................=25
30-40............................=35
40-50......................... ..=45
total frequency=100
xifi=2640
mean=xifi÷fi
2640÷100=26.4
10-20.............................==15
20-30...........................=25
30-40............................=35
40-50......................... ..=45
total frequency=100
xifi=2640
mean=xifi÷fi
2640÷100=26.4
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