# Solve this: Q.30. The mean of the following frequency distribution is 47. Find the value of 'p'. Classes 0- 20 20- 40 40- 60 60- 80 80- 100 Frequency 8 15 20 p 5

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 Class Frequency ${f}_{i}$ ${f}_{i}{x}_{i}$ 0-20 8 10 80 20-40 15 30 450 40-60 20 50 1000 60-80 p 70 70p 80-100 5 90 450 $\sum {f}_{i}=48+p$ $\sum {f}_{i}{x}_{i}=1980+70p$

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