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# RD Chapter 25- Probability Ex-VSAQS Interview Questions Answers

### Related Subjects

Question 1 : Define a trial.

Answer 1 : When we perform an experiment, it is called a trial of the experiment.

Question 2 : Define an elementary event.

Answer 2 : An outcome of a trial of an experiment is called an elementary event.

Question 3 : Define an event.

Answer 3 : An event association to a random experiment is said to occur in a trial.

Question 4 : Define probability of an event.

In n trials of a random experiment if an event A happens m times, then probability of happening
of A is given by P(A) = m/n

Question 5 : A bag contains 4 white balls and some red balls. If the probability of drawing a white ball from the bag is 25, find the number of red balls in the bag

No. of white balls = 4
Let number of red balls = x
Then total number of balls (n) = 4 white + x red = (4 + x) balls

Question 6 : A die is thrown 100 times. If the probability of getting an even number is 25. How many times an odd number is obtained?

Total number of a die is thrown = 100
Let an even number comes x times, then probability of an even number = x/100

Question 7 :
Three coins are tossed simultaneously 200 times with the following frequencies of different outcomes

Find the probability of getting at most two heads.

Total number of three coins are tossed (n) = 200
Getting at the most 2 heads (m) = 72 + 77 + 28 = 177
Probability P(A) = m/n = 177/200

Question 8 : In the Q. No. 7, what is the probability of getting at least two heads?

Total number of possible events = 200
No. of events getting at the least = 2 heads (m) = 23 + 72 = 95
Probability P(A) = m/n = 95/200 = 19/40

krishan