A frequency table records ages: $5$-$10$: $4$, $10$-$15$: $7$, $15$-$20$: $9$, $20$-$25$: $5$. Find the…

A frequency table records ages: $5$-$10$: $4$, $10$-$15$: $7$, $15$-$20$: $9$, $20$-$25$: $5$. Find the total frequency.
  1. $20$
  2. $23$
  3. $25$
  4. $30$

Solution

Total $= 4+7+9+5 = 25$.

Asked in: IMO

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