Question

The blood groups of the persons who had donated blood at a blood donation camp are as follows:
$\begin{array}{cccccccccc}\mathrm{A}& \mathrm{AB}& \mathrm{O}& \mathrm{B}& \mathrm{AB}& \mathrm{A}& \mathrm{B}& \mathrm{A}& \mathrm{A}& \mathrm{A}\\ \mathrm{A}& \mathrm{B}& \mathrm{O}& \mathrm{O}& \mathrm{O}& \mathrm{B}& \mathrm{O}& \mathrm{AB}& \mathrm{A}& \mathrm{AB}\\ \mathrm{O}& \mathrm{A}& \mathrm{O}& \mathrm{B}& \mathrm{A}& \mathrm{B}& \mathrm{A}& \mathrm{O}& \mathrm{O}& \mathrm{B}\end{array}$
Use this information to complete the table below.

Blood group	Tally marks	Frequency
A
B
AB
O

(1) Which blood group has the least number of donors?
(2) Which blood group has the most donors?
(3) How many donors are of the 'B' blood group?
(4) What was the total number of donors at the camp?

Answer 1

(1) ‘AB’ blood group has the least number of donors.
(2) ‘A’ blood group has the most donors.
(3) There are 7 donors of ‘B’ blood group.
(4) There were 30 donors at the camp.