3. Age of people who attended a concert has been recorded as follows: Age, x (years) 10 – 15 Frequency 8. - 15 - 20 14 20 – 35 36 - 35 – 50 28 50 - 70 4 (а) Draw the histogram on a graph paper. (b) Hence, find the mean and standard deviation, leave your answer in 2 decimal places.

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