Histogram class intervals are $10$-$20, 20$-$30, 30$-$40, 40$-$50$ with frequencies $6, 10, 14, 5$. How many…

Histogram class intervals are $10$-$20, 20$-$30, 30$-$40, 40$-$50$ with frequencies $6, 10, 14, 5$. How many observations are below $30$?
  1. $10$
  2. $14$
  3. $16$
  4. $20$

Solution

Below $30$ $=$ classes $10$-$20$ and $20$-$30$ $= 6+10 = 16$.

Asked in: IMO

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