Class IX Math
Hots for Probability
1. The record of a weather station shows that out of the past 250 consecutive days, its weather forecast were correct 175 times.
(i) What is the probability that on a given day it was correct?
(ii) What is the probability that it was not correct on a given day?
2. A die is thrown once. Find the probability of getting a prime number.
3. A coin is thrown once. Find the probability of getting a head.
4. From a group of 2 boys and 3 girls, we select a child. Find the probability of this child being a girl.
5. If we throw a die, then the upper face shows 1 or 2; or 3 or 4; or 5 or 6. Suppose we throw a die 150 times and get 2 for 75 times. What is the probability of getting a �2�?
6. A coin is tossed 200 times and is found tha ta tail comes up for 120 times. Find the probability of getting a tail.
7. If a coin is tossed for a certain number of times. How many times the coin was tossed, if the probability of getting a head is 0.4 and it appeared up for 24 times?
8. In a GK test a student was given 50 questions one by one. He gave the correct answer for 30 questions. Find the probability of giving correct answers.
9. Define a (i) Theorem, (ii) Axiom and (iii) Conjecture.
10. Prove that the product of two even natural numbers is divisible by 16.