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:
Mid-point | Frequency |
5 | 4 |
15 | 8 |
25 | 13 |
35 | 12 |
45 | 6 |
Answer:
Class | |||||
Frequency |
Class size = 10