Question

52. The mean of the following frequency distribution is 43.75 by step deviation :
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Class
0-10
10-20 20-30 30-40 40-50 50-60 60-70 70-80 80-90 90 - 100
8
4
Frequency
20
45
64
32
f
8
2
2
Find the missing frequency f.​

Answer 1

Answer:

f = 177

Step-by-step explanation:

Mean = Sum of observations / no. of observations

43.75 = 20 +45 + 64 + 32 + f + 8 + 2 + 2 / 8

43.75 × 8 = 173 + f

350 - 173 = f

177 = f

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