NCERT Solutions
Class 9 Maths
Statistics

Ex.14.2 Q.1
The blood group record of 30 pupil of standard 9th is recorded in a following data:
A, O, AB, B, O, O, O, A, B, B, O, A, O, A, O, AB, A, O, O, A, O, A, AB, B, O, A, A, B, O, B
Illustrate this report in a form of a frequency distribution table.
Give the rarest blood group of these pupils present in the classroom.
The frequency refers to the number of students having same blood group.
We will represent the data in table:
Most common Blood Group (Highest frequency): O
Rarest Blood Group (Lowest frequency): AB