Experts plzz solve this

Experts plzz solve this Q.35. Calculate the arithmetic mean, standard deviation and variance from the following distribution: Frequency 0-5 2 5-10 10-15 15-20 20-25 25-30 30-35 5 7 13 21 16 8 35-40 3 [X = 21.9, S.D . 7.99, 0-2 = 6397]

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