RBSE Class 9 Maths Important Questions Chapter 15 Probability

Rajasthan Board RBSE Class 9 Maths Important Questions Chapter 15 Probability Important Questions and Answers.

RBSE Class 9 Maths Chapter 15 Important Questions Probability

Question 1.
A coin is tossed 200 times with the following outcomes:
Head - 11 times
Tail - 88 times
In a single throw of a coin what is the probability of getting a tail?
(a) \(\frac{11}{25}\)
(b) \(\frac{14}{25}\)
(c) \(\frac{11}{14}\)
(d) \(\frac{14}{11}\)

Question 2.
In 50 tosses of a coin, tail appears 32 times. If a coin is tossed at random, what is the probability of getting a head?
(a) \(\frac{1}{32}\)
(b) \(\frac{1}{18}\)
(c) \(\frac{16}{25}\)
(d) \(\frac{9}{25}\)

Question 3.
A die is thrown 40 times and each time the number on the uppermost face is noted. It was recorded as under:

A die is thrown at random. What is the probability of getting a 5?
(a) \(\frac{5}{7}\)  
(b) \(\frac{7}{5}\)
(c) \(\frac{1}{8}\)
(d) \(\frac{7}{40}\)

Question 4.
It is given that the probability of winning a game is 0.7. What is the probability of losing the game?
(a) 0.8
(b) 0.3
(c) 0.7
(d) 0.07

Question 5.
In a group of 60 persons, 35 like coffee. Out of this group, if one person is chosen at random, what is the probability that he or she does not like coffee?
(a) \(\frac{7}{12}\)
(b) \(\frac{5}{12}\)
(c) \(\frac{5}{7}\)
(d) \(\frac{3}{12}\)

Question 6.
80 bulbs are selected at random from a lot and their life time (in hours) is recorded in the form of a frequency table given below:

One bulb is selected at random from the lot. The probability that its life time is 1150 hours is:
(a) \(\frac{1}{80}\)
(b) \(\frac{7}{16}\)
(c) 0
(d) 1

Question 7.
The probability of any event of an experiment:
(a) is 1
(b) is greater than 1.
(c) is 0
(d) lies between 0 and 1 (both inclusive).

Question 8.
The coins are tossed 1000 times and the outcomes are recorded as below :

Based on this information, the probability for at most one head is :
(a) \(\frac{1}{5}\)
(b) \(\frac{1}{4}\)
(c) \(\frac{4}{5}\)
(d) \(\frac{3}{4}\)

Question 9.
In a survey of 364 children aged 19-36 months, It was found that 91 liked to eat potato chips. If a child is selected at random, the probability that he/she does not like to eat potato chips is :
(a) 0.25
(b) 0.50
(c) 0.75
(d) 0.80

Question 10.
A die is thrown 1000 times and the outcomes were recorded as follows :

If the die is thrown once more, then the probability that is shows 5 is:
(a) \(\frac{9}{50}\)
(b) \(\frac{3}{20}\)
(c) \(\frac{4}{25}\)
(d) \(\frac{7}{25}\)

Question 11.
In the medical examination of students of a class, the following blood groups are recorded:

A student is selected at random from the class. The probability that he/she has blood group B is :
(a) \(\frac{1}{4}\)
(b) \(\frac{13}{40}\)
(c) \(\frac{3}{10}\)
(d) \(\frac{1}{8}\)