Math Quiz on Probability
Directions (1-5): Answer the following questions based on statement given below-
Two dice are rolled simultaneously. Find the probability of-
Q 1. Getting a sum greater than 9
Ans: 1/6
Q 2. Getting a doublet
Ans: 1/6
Q 3. Getting the sum of numbers on the on the two faces divisible b 3 or 4
Ans: 5/9
Q 4. Getting the sum as a prime number
Ans: 5/12
Q 5. Getting at least one 5
Ans: 11/36
Q 6. If there are two children in a family, find the probability that there is at least one girl in the family.
Ans: 3/4
Q 7. A box contains 5 defective and 15 non-defective bulbs. Two bulbs are chosen at random. Find the probability that both the bulbs are non-defective.
Ans: 21/38
Q 8. A box contains 5 defective and 15 non-defective bulbs. 4 bulbs are chosen at random. Find the probability that at least 3 bulbs are defective.
Ans: 31/969
Q 9. The odds against of an event are 5:7, find the probability of occurrence of this event
Ans: 7/12
Q 10. Four cards are drawn at random from a pack of 52 cards. Find the probability of getting all the four cards of same number?
Ans: 1/20825