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.