calculate mean step deviations method
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Answer:
mean = 5.4
Step-by-step explanation:
C . I fi xi ui fiui
0-10 5 5 -30 -150
10-20 7 15 -20 -140
20-30 12 25 -10 -120
30-40 16 35(a) 0 0
40-50 6 45 10 60
50-60 4 55 20 80
∑fi = 50 ∑fiui = -270
mean = ∑fiui
∑fi
= -270/50
= -5.4
but since marks cannot be negative,
mean = 5.4
hope this helps..
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