Fast pls
I will mark it as brainlist
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C.I.___freq.__ x__fx
0-20__ 5___10__ 50
20-40_ 8___30_240
40-60_ X___50_50x
60-80_12___70_840
80-100_7___90_630
100-120_8__110_880
Sum:(40+x)__(2640+50x)
fx/f=Mean
2640+50X /40+X =62.8
2512+62.8X=2640+50X
62.8X-50X = 2640-2512
12.8X = 128
X=128/12.8
X=10
Hence proved
Hope it helps you :)
0-20__ 5___10__ 50
20-40_ 8___30_240
40-60_ X___50_50x
60-80_12___70_840
80-100_7___90_630
100-120_8__110_880
Sum:(40+x)__(2640+50x)
fx/f=Mean
2640+50X /40+X =62.8
2512+62.8X=2640+50X
62.8X-50X = 2640-2512
12.8X = 128
X=128/12.8
X=10
Hence proved
Hope it helps you :)
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