Histogram: classes $0$-$10, 10$-$20, 20$-$30, 30$-$40, 40$-$50$ with frequencies $2, 5, 9, 7, 2$. Total…

Histogram: classes $0$-$10, 10$-$20, 20$-$30, 30$-$40, 40$-$50$ with frequencies $2, 5, 9, 7, 2$. Total observations are:
  1. $20$
  2. $23$
  3. $25$
  4. $30$

Solution

Total $= 2+5+9+7+2 = 25$.

Asked in: IMO

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