NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 8
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Exercise 14.3
Q.1. The blood groups of 30 students are recorded as follows: A, B, O, A, AB, O, A, O, B, A, O, B, A, AB, B, A, AB, B, A, A, O, A, AB, B, A, O, B, A, B, A Prepare a frequency distribution table for the data.
Answer:
Blood Group  Number of Students (frequency) 
A  12 
B  8 
AB  4 
O  6 
Total  30 
Q.2. The value of π upto 35 decimal places is given below: Make a frequency distribution of the digits 0 to 9 after the decimal point.
Answer:
Digit  0  1  2  3  4  5  6  7  8  9 
Frequency  1  2  5  6  3  4  3  2  5  4 
Q.3. The scores (out of 100) obtained by 33 students in a mathematics test are as follows:
Represent this data in the form of a frequency distribution.
Answer:
Scores  48  58  64  66  69  71  73  81  83  84 
Frequency  3  3  4  7  6  3  2  1  2  2 
Q.4. Prepare a continuous grouped frequency distribution from the following data:
Midpoint  Frequency 
5  4 
15  8 
25  13 
35  12 
45  6 
Answer:
Class 





Frequency 





Class size = 10