Histogram of weights (kg): $40$-$50$: $5$, $50$-$60$: $9$, $60$-$70$: $11$, $70$-$80$: $5$. Which class is…

Histogram of weights (kg): $40$-$50$: $5$, $50$-$60$: $9$, $60$-$70$: $11$, $70$-$80$: $5$. Which class is the modal class?
  1. $40$-$50$
  2. $50$-$60$
  3. $60$-$70$
  4. $70$-$80$

Solution

Modal class $=$ class with maximum frequency $= 60$-$70$ ($f=11$).

Asked in: IMO

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