From the following data calculate the missing frequency : No. of tablets : 4–8 8–12 12–16 16–20 20–24 24-28 28-32 No of persons cured : No. of tablets : 32- 36 36 - 40 No. of persons 11 13 16 14 ? 9 17 cured : 6 The average number of tablets to cure a person is 20.

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