Advertisements
Advertisements
प्रश्न
A lot consists of 144 ballpoint pens of which 20 are defective and others good. Tanvy will buy a pen if it is good, but will not buy it if it is defective. The shopkeeper draws one pen at random and gives it to her. What is the probability that she will not buy it?
उत्तर
Let E2 be the event of getting a defective pen.
∴ P(not buying a pen) = P(E2) = `("Number of outcome favourable to" E_2)/"Number of all possible outcomes"`
`=20/144 = 5/36`
Thus, the probability that Tanvy will not buy a pen is `5/36`
APPEARS IN
संबंधित प्रश्न
A bag contains cards numbered from 1 to 49. A card is drawn from the bag at random, after mixing the cards thoroughly. Find the probability that the number on the drawn card is an odd number.
A card is drawn at random from a well-shuffled deck of playing cards. Find the probability that the card drawn is neither a jack nor a king.
Cards numbered from 11 to 60 are kept in a box. If a card is drawn at random from the box, find the probability that the number on the drawn card is divisible by 5
Two dice are rolled once. Find the probability of getting such numbers on the two dice, whose product is 12.
Red queens and black jacks are removed from a pack of 52 playing cards. A card is drawn at random from the remaining cards, after reshuffling them. Find the probability that the card drawn is of red colour
A bag contains 5 red, 8 green and 7 white balls, One ball is drawn at random from the bag. What is the probability of getting a white ball or a green ball?
The probability that a number selected at random from the numbers 1, 2, 3, ..., 15 is a multiple of 4, is
A number x is chosen at random from the numbers −3, −2, −1, 0, 1, 2, 3 the probability that | x | < 2 is
A game of chance consists of spinning an arrow, which comes to rest pointing at one of the numbers 1, 2, 3, 4, 5, 6, 7, 8 and these are equally likely outcomes. Find the probability that the arrow will point at any factor of 8.
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?
All kings, queens and aces are removed from a pack of 52 cards. The remaining cards are well-shuffled and then a card is drawn from it. Find the probability that the drawn card is a red card.
Cards numbered 7 to 40 were put in a box. Poonam selects a card at random. What is the probability that Poonam selects a card which is a multiple of 7?
A coin is tossed twice. Find the probability of getting: two heads
From 10 identical cards, numbered 1, 2, 3, ……, 10, one card is drawn at random. Find the probability that the number on the card drawn is a multiple of
3
A manufacturer tested 7000 LED lights at random and found that 25 of them were defective. If a LED light is selected at random, what is the probability that the selected LED light is a defective one
A man is known to speak the truth 3 out of 4 times. He throws a die and a number other than six comes up. Find the probability that he reports it is a six.
What is the probability that the minute and hour hands of a clock will form an acute angle at any given time?
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 the experiment of tossing a coin one time, the outcome is either ______ or ______.
At a Birthday Party, the children spin a wheel to get a gift. Find the probability of getting a ball
