17. An experiment is carried out on the rearing of cows. The mass gain (in kilogram) for 100 cows during a certain period are recorded in the following table. Mass gain (kg) Frequency 15 - 19 37 5-9 10 - 14 20 - 24 25 - 29 30 - 34 3 28 16 14 2 Calculate a. the mean and median. b. the first quartile and 65th percentile.

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