find the following data calculate the missing frequency.number of tablets 4-8 8-12 12-16 16-20 20-24 24-28 28-32 32-36 36-40.number of person cured 11 13 16 14 ? 9 17 6 4.the average number of tablets to cure fever was 19.9.
Answers
Given :
number of tablets 4-8 8-12 12-16 16-20 20-24 24-28 28-32 32-36 36-40
number of person cured 11 13 16 14 ? 9 17 6 4
average number of tablets to cure fever was 19.9.
To Find : Missing frequency
Solution:
number of tablets Mid value f midvalue * f
4-8 6 11 66
8-12 10 13 130
12-16 14 16 224
16-20 18 14 252
20-24 22 X 22X
24-28 26 9 234
28-32 30 17 510
32-36 34 6 204
36-40 38 4 152
Total 90 + X 1772 + 22X
Mean = 19.9
=> 19.9 = (1772 + 22X)/(90 + X)
=> 1791 +19.9X = 1772 + 22X
=> 19 = 2.1X
=> X = 9
Missing frequency = 9
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