The word trial means a test of performance, qualities, or suitability. Any particular performance of a random experiment is called a trial. That is, when we perform an experiment it is called a trial of the experiment. By experiment or trial, we mean a random experiment unless otherwise specified. Where you are required to differentiate between a trial and an experiment, consider the experiment to be a larger entity formed by the combination of a number of trials. To illustrate the definition, let us take examples 1 . In the experiment of tossing 4 coins, we may consider tossing each coin as a trial and therefore say that there are 4 trials in the experiment. 2 . In the experiment of rolling a dice 5 times, we may consider each rolls as a trial and therefore say that there are 5 trials in the experiment. Note that rolling a dice 5 times is same as rolling 5 dices each one time. Similarly, tossing 4 coins is same as tossing one coin 4 times.

The word event means something that resulting in. An event is a collection of outcomes of a trial of a random experiment. To illustrate the definition, let us take examples: When two coins are tossed simultaneously, the possible outcomes are HH , HT , TH and TT . Any one outcome like HH is called an event (elementary event). The collections like { HH , HT } , { HH , HT , TT } etc are all events (compound event). In the experiment of rolling a dice, the total possible outcomes are 6 and they are 1 , 2 , 3 , 4 , 5 and 6 . Any one outcome like 4 is called an event (elementary event). The collections like { 1 , 2 } , { 1 , 2 , 3 } , { 2 , 5 , 6 } , { 2 , 3 , 4 , 5 } etc are all events (compound events). Note that H stands for getting a head and T stands for getting a tail in the experiment of tossing a coin.

Mathematics Class 9>Chapter 25 - Probability>VERY SHORT ANSWER TYPE QUESTIONS (VSAQs)

R. D. Sharma Solutions for Chapter: Probability, Exercise 2: VERY SHORT ANSWER TYPE QUESTIONS (VSAQs)

Author:R. D. Sharma

R. D. Sharma Mathematics Solutions for Exercise - R. D. Sharma Solutions for Chapter: Probability, Exercise 2: VERY SHORT ANSWER TYPE QUESTIONS (VSAQs)

Attempt the practice questions on Chapter 25: Probability, Exercise 2: VERY SHORT ANSWER TYPE QUESTIONS (VSAQs) with hints and solutions to strengthen your understanding. Mathematics Class 9 solutions are prepared by Experienced Embibe Experts.

Questions from R. D. Sharma Solutions for Chapter: Probability, Exercise 2: VERY SHORT ANSWER TYPE QUESTIONS (VSAQs) with Hints & Solutions

EASY

9th CBSE

IMPORTANT

Mathematics Class 9>Chapter 25 - Probability>VERY SHORT ANSWER TYPE QUESTIONS (VSAQs)>Q 1

Define a trial.

EASY

9th CBSE

IMPORTANT

Mathematics Class 9>Chapter 25 - Probability>VERY SHORT ANSWER TYPE QUESTIONS (VSAQs)>Q 2

Define an elementary event.

EASY

9th CBSE

IMPORTANT

Mathematics Class 9>Chapter 25 - Probability>VERY SHORT ANSWER TYPE QUESTIONS (VSAQs)>Q 3

Define an event.

EASY

9th CBSE

IMPORTANT

Mathematics Class 9>Chapter 25 - Probability>VERY SHORT ANSWER TYPE QUESTIONS (VSAQs)>Q 4

Define probability of an event.

MEDIUM

9th CBSE

IMPORTANT

Mathematics Class 9>Chapter 25 - Probability>VERY SHORT ANSWER TYPE QUESTIONS (VSAQs)>Q 5

A bag contains $4$ white balls and some red balls. If the probability of drawing a white ball from the bag is $\frac{2}{5}$ , find the number of red balls in the bag.

MEDIUM

9th CBSE

IMPORTANT

Mathematics Class 9>Chapter 25 - Probability>VERY SHORT ANSWER TYPE QUESTIONS (VSAQs)>Q 6

A die is thrown $100$ times. If the probability of getting an even number is $\frac{2}{5}$ . How many times an odd number is obtained

EASY

9th CBSE

IMPORTANT

Mathematics Class 9>Chapter 25 - Probability>VERY SHORT ANSWER TYPE QUESTIONS (VSAQs)>Q 7

Three coins are tossed simultaneously $200$ times with the following frequencies of different outcomes: