Question

The blood groups of 30 students of Class VIII are recorded as follows.
A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O,
A, AB, O, A, A, O, O, AB, B, A, O, B, A, B, O.
Represent this data in the form of a frequency distribution table. Which is the most common, and which is the rarest, blood group among these students?

Answer 1

Provided the frequency distribution table in the above attachment -

As , you can see in the attachment-

Blood group in the First column

Tally in the Second column

Number of students in the Third column.

Number of students with "A" group = 9

Number of students with "B" group = 6

Number of students with "AB" group = 3

Number of students with "O" group = 12


Total number of students -

= 9 + 6 + 3 + 12 = 30


Finding Most common Blood Group -


Most common Blood Group is the blood group with maximum number of students = "O"


Finding Rarest Blood Group -

Rarest Blood Group is the blood group with minimum number of students. = "AB".

Answer 2

Given : The blood groups of 30 students of Class VI are recorded as follows:

A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O,A, AB, O, A, A, O, O, AB, B, A, O, B, A, B, O.

To Find : Represent this data in the form of a frequency distribution table.

Which is the most common blood group among these students?​

Solution:

frequency distribution table

A           9             $\setlength{\unitlength}{1cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){4}{\line(0, 1){0.5}} \put(1.8, 1){\line(2, 1){1}} \end{picture}$    $\setlength{\unitlength}{1cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){4}{\line(0, 1){0.5}}\end{picture}$

B            6            $\setlength{\unitlength}{1cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){4}{\line(0, 1){0.5}} \put(1.8, 1){\line(2, 1){1}} \end{picture}$    $\setlength{\unitlength}{1cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){1}{\line(0, 1){0.5}}\end{picture}$

O           12            $\setlength{\unitlength}{1cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){4}{\line(0, 1){0.5}} \put(1.8, 1){\line(2, 1){1}} \end{picture}$  $\setlength{\unitlength}{1cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){4}{\line(0, 1){0.5}} \put(1.8, 1){\line(2, 1){1}} \end{picture}$ $\setlength{\unitlength}{1cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){2}{\line(0, 1){0.5}}\end{picture}$

AB          3               $\setlength{\unitlength}{1cm} \begin{picture}(4,4) \multiput(2, 1)(0.2, 0){3}{\line(0, 1){0.5}}\end{picture}$

Most common blood Group is A  

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