arithmetic mean:-
more than - 85, 70 ,55, 40, 25, 10
no.of person- 1,4,30, 74, 94, 100
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Step-by-step explanation:
more than - 85, 70 , 55, 40, 25, 10
no.of person- 1, 4, 30, 74, 94, 100
C I 85-100 70-85 55-70 40-55 25-40 10-25
f 1 3 26 38 20 6
xi 92.5 77.5 62.5 47.5 32.5 17.5
ui -2 -1 0 1 2 3
fiui -2 -3 0 38 40 18
£fiui= 91
£fi= 94
A= 62.5
h=15
mean A+( £fiui/£fi)×h
= 62.5 + (91/94)×15
= 62.5+ 14.52
= 77.02(approximately)
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