find the mean by assumed mean method ( class 0-20, 20-40, 40-60, 60-80, 80-100) frequence 25,16,28,20,5
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Answer:
answer -
C.I ---- fi------- Xi-------- di=(xi-A)------- £fidi
0-20 25 10 -40 -1000
20-40 16 30 -20 -320
40-60 28 A=50 0 0
60-80 20 70 20 400
80-100 5 90 40 200
________________________________________
£fi=94 £fidi= -720
mean =A+£fidi
£fi
= 50+(-720)
94
=50-7.65
=42.35 answer.