A histogram has class intervals $0$-$10, 10$-$20, 20$-$30, 30$-$40$ with frequencies $5, 8, 12, 7$. What is…

A histogram has class intervals $0$-$10, 10$-$20, 20$-$30, 30$-$40$ with frequencies $5, 8, 12, 7$. What is the total number of observations?
  1. $25$
  2. $30$
  3. $32$
  4. $40$

Solution

Total $= 5+8+12+7 = 32$.

Asked in: IMO

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