A frequency distribution: $0$-$10$: $5$, $10$-$20$: $9$, $20$-$30$: $14$, $30$-$40$: $10$, $40$-$50$: $2$.…

A frequency distribution: $0$-$10$: $5$, $10$-$20$: $9$, $20$-$30$: $14$, $30$-$40$: $10$, $40$-$50$: $2$. How many observations are at least $20$ but less than $40$?
  1. $14$
  2. $20$
  3. $24$
  4. $26$

Solution

Add frequencies of classes $20$-$30$ and $30$-$40$: $14+10 = 24$.

Asked in: IMO

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