NCERT Solutions for Class 9 Maths Chapter 15

Important NCERT Questions

Probability

NCERT Books for Session 2022-2023

CBSE Board, UP Board and Other state Boards

EXERCISE 15.1

Page No:285

Questions No:9

# Activity : Note the frequency of two-wheelers, three-wheelers and four-wheelers going past during a time interval, in front of your school gate. Find the probability that any one vehicle out of the total vehicles you have observed is a two-wheeler.

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The frequency table of the two-wheelers, three-wheelers and four-wheelers going past during 2:30 pm to 3:30 pm in front of our school is given below:

Vehicle Two-wheelers Three-wheelers Four-wheelers Total

Frequency 12 7 9 28

Total number of vehicles = 28 and number of two- wheelers = 12

Therefore,

P(two – wheelers ) = 12/28 = 3/7

Hence, the probability of two- wheelers is 3/7.