A frequency table of marks of 30 students is: $10$-$\,2$, $20$-$\,5$, $30$-$\,8$, $40$-$\,7$, $50$-$\,?$.…

A frequency table of marks of 30 students is: $10$-$\,2$, $20$-$\,5$, $30$-$\,8$, $40$-$\,7$, $50$-$\,?$. What is the missing frequency for class $50$?
  1. $5$
  2. $6$
  3. $7$
  4. $8$

Solution

Sum of given frequencies $= 2+5+8+7 = 22$. Missing frequency $= 30-22 = 8$.

Asked in: IMO

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