A frequency table shows: blood group $A$-$\,9$, $B$-$\,6$, $AB$-$\,3$, $O$-$\,12$. What is the total number…

A frequency table shows: blood group $A$-$\,9$, $B$-$\,6$, $AB$-$\,3$, $O$-$\,12$. What is the total number of people surveyed?
  1. $24$
  2. $27$
  3. $30$
  4. $33$

Solution

Total $= 9+6+3+12 = 30$.

Asked in: IMO

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