NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 8 (For CBSE, ICSE, IAS, NET, NRA 2022)

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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:

The Blood Groups of 30 Students Are Recorded as Follows
Blood GroupNumber of Students (frequency)
A12
B8
AB4
O6
Total30

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:

The Value of Π Upto 35 Decimal Places is Given Below
Digit0123456789
Frequency1256343254

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:

The Scores (Out of 100) Obtained by 33 Students in a Mathematics Test Are as Follows
Scores48586466697173818384
Frequency3347632122

Q. 4. Prepare a continuous grouped frequency distribution from the following data:

Prepare a Continuous Grouped Frequency Distribution from the Following Data
Mid-pointFrequency
54
158
2513
3512
456

Answer:

Continuous Grouped Frequency Distribution Class Size = 10
Class
Frequency

Class size = 10