Q) Rahul and Ravi planned to play Business ( board game) in which they were supposed to use two dice. 1. Ravi got first chance to roll the dice. What is the probability that he got the sum of the two numbers appearing on the top face of the dice is 8? a) […]
probability
Q) Three coins are tossed simultaneously. What is the probability of getting (i) at least one head? (ii) exactly two tails? (iii) at most one tail? Ans: Since a coin has two possible outcomes (H, T) ∴ Total outcomes of 3 coins = 23 = 8 [i.e. (H, H, T), (H, H, H), (H, T,
Three coins are tossed simultaneously. What is the probability of getting Read More »
Q) A box contains 90 discs which are numbered 1 to 90. If one disc is drawn at random from the box, find the probability that it bears a : (i) 2-digit number less than 40 (ii) number divisible by 5 and greater than 50 (iii) a perfect square number Ans: Total Number of discs
A box contains 90 discs which are numbered 1 to 90. If one disc is drawn at random Read More »
Q) In a two-dice game, a player throws two dice simultaneously. A player scores the sum of the two dice thrown and gradually reaches a higher score as they continue to roll. Answer the following questions: i. Find the probability that the difference between the numbers on the two dice is 3. ii. Find the probability
In a two-dice game, a player throws two dice simultaneously. A player scores the sum Read More »
Q) How many positive three digit integers have the hundredths digit 8 and unit’s digit 5? Find the probability of selecting one such number out of all three digit numbers. Ans: 3 digit integers with hundredths digit as 8 will lie between 800 and 999 Now, numbers with unit’s digit as 5 will be 805,
How many positive three digit integers have the hundredths digit 8 and unit’s digit 5? Read More »
Q) Two dice are rolled together bearing numbers 4, 6, 7, 9, 11, 12. Find the probability that the product of numbers obtained is an odd number Ans: The numbers on each dice are 4, 6, 7, 9, 11, 12. ∴ Total possible outcomes = 6 x 6 = 36 To get product of 2
Two dice are rolled together bearing numbers 4, 6, 7, 9, 11, 12. Find the Read More »
Q) One card is drawn at random from a well shuffled deck of 52 cards. Find the probability that the card drawn (i) is queen of hearts (ii) is not a jack. Ans: (i) probability to get queen of hearts Since there is only one Queen of hearts in a deck of 52 cards ∴
Q) A departmental store sends bills to charge its customers once a month. Past experience shows that 70% of its customers pay their first month bill in time. The store also found that the customer who pays the bill in time has the probability of 0.8 of paying in time next month and the customer who
A departmental store sends bills to charge its customers once a month. Past experience Read More »
Q) In a survey on holidays, 120 people were asked to state which type of transport they used on their last holiday. The following pie chart shows the result of the survey. Observe the pie chart and answer the following questions:1 (i) If one person is selected at random, find the probability that he/she travelled
Q) In a pack of 52 playing cards one card is lost. From the remaining cards, a card is drawn at random. Find the probability that the drawn card is queen of heart, if the lost card is a black card. Ans: We have 52 cards in a pack. From the given pack of 52
In a pack of 52 playing cards one card is lost. From the remaining cards, Read More »