Advertisements
Advertisements
प्रश्न
A piggy bank contains hundred 50 p coins, seventy ₹1 coin, fifty ₹2 coins and thirty ₹5 coins. If it is equally likely that one of the coins will fall out when the bank is turned upside down, what is the probability that the coin will not be a ₹5 coin?
उत्तर
Number of 50 p coins = 100.
Number of ₹1 coins = 70.
Number of ₹2 coins = 50.
Number of ₹5 coins = 30.
Thus, total number of outcomes = 250.
Let E2 be the event of not getting a ₹5 coin.
Number of favourable outcomes = 250 − 30 = 220
∴ P(not getting a ₹5 coin) = P(E2) = `("Number of outcomes favourable to" E_2)/"Number of all possible outcomes"`
`= 220/250 = 22/25`
Thus, the probability that the coin will not be a ₹5 coin is `22/25`.
APPEARS IN
संबंधित प्रश्न
A die is thrown, then find the probability of the following events:
A is an Event: getting an odd number on the top upper surface of the die.
B is an Event: getting a perfect square on the upper surface of the die.
Rahim tosses two different coins simultaneously. Find the probability of getting at least one tail.
All red face cards are removed from a pack of playing cards. The remaining cards were well shuffled and then a card is drawn at random from them. Find the probability that the drawn card is
(i) a red card
(ii) a face card
(iii) a card of clubs
All jacks, queens and kings are removed from a pack of 52 cards. The remaining cards are well-shuffled and then a card is randomly drawn from it. Find the probability that this card is a red card.
A die thrown once. What is the probability of getting a number lying between 2 and 6?
Which of the following cannot be the probability of an event?
Aarushi sold 100 lottery tickets in which 5 tickets carry prizes. If Priya purchased a ticket, what is the probability of Priya winning a prize?
17 cards numbered 1, 2, 3, 4, .... ,17 are put in a box and mixed thoroughly. A card is drawn at random from the box. Find the probability that the card drawn bears an odd number.
A card is drawn at random from a well-shuffled pack of 52 cards. Find the probability of getting a red king,
A card is drawn at random from a well-shuffled pack of 52 cards. Find the probability of getting a queen or a jack.
Five cards − the ten, jack, queen, king and ace of diamonds are well shuffled with their faces downwards. One card is then picked up at random. What is the probability that the drawn card is the queeen?
A coin is tossed 800 times and the outcomes were noted as: Head:415 ,Tail:385
Find the probabiity of the min showing up (i)a head ,(ii) a tai .
In a certain race there are three boys A, B, C. The winning probability of A is twice than B and the winning probability of B is twice than C. If P(A) + P(B) + P(C) = 1, then find the probabilities of their winning.
A die is thrown once. Find the probability of getting.
(a) a prime number.
(b) an odd number
A card is drawn at random from a pack of 52 playing cards. Find the probability of drawing a card that is neither a spade nor a king.
Three identical coins are tossed together. What is the probability of obtaining:
all heads?
A die is thrown once. Find the probability of getting:
a number greater than 6.
Frame two problems in calculating probability, based on the spinner shown here.
Rohan and Shalu are playing with 5 cards as shown in the figure. What is the probability of Rohan picking a card without seeing, that has the number 2 on it?
In a throw of a dice, the probability of getting an even number is the same as that of getting an odd number.
