A histogram of marks shows: $0$-$20$: $4$, $20$-$40$: $9$, $40$-$60$: $15$, $60$-$80$: $8$, $80$-$100$: $4$.…

A histogram of marks shows: $0$-$20$: $4$, $20$-$40$: $9$, $40$-$60$: $15$, $60$-$80$: $8$, $80$-$100$: $4$. Which class has the highest frequency?
  1. $0$-$20$
  2. $20$-$40$
  3. $40$-$60$
  4. $60$-$80$

Solution

Maximum frequency $= 15$ in class $40$-$60$.

Asked in: IMO

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