Advertisements
Advertisements
Question
1000 families with 2 children were selected randomly , and the following data were recorded :
| Number of girls in a family | 0 | 1 | 2 |
| Number of families | 333 | 392 | 275 |
Find the probability of a family , having
(i) 1 girl
Solution
Total number of families = 333 + 392 + 275 = 1000
(i) Number of families having 1 girl = 392
`"Required probability" = "Number of families having 2 girls"/"Total number of families"`
= `392/1000 = 49/125`
APPEARS IN
RELATED QUESTIONS
A game consists of tossing a one rupee coin 3 times and noting its outcome each time. Hanif wins if all the tosses give the same result, i.e., three heads or three tails, and loses otherwise. Calculate the probability that Hanif will lose the game.
In a class, there are 18 girls and 16 boys. The class teacher wants to choose one pupil form class monitor. What she does, she writes the name of each pupil on a card and puts them into a basket and mixes thoroughly. A child is asked to pick one card from the basket. What is the probability that the name written on the card is the name of a girl?
Two dice are thrown simultaneously. What is the probability that 5 wifi come up at both dice?
A circle with diameter 20 cm is drawn somewhere on a rectangular piece of paper with length 40 cm and width 30 cm. This paper is kept horizontal on table top and a dice, very small in size, is dropped on the rectangular paper without seeing towards it. If the dice falls and lands on the paper only, find the probability that it will fall and land outside the circle.
In a game of chance, a spinning arrow comes to rest at one of the numbers 1, 2, 3, 4, 5, 6, 7, 8. All these are equally likely outcomes. Find the probability that it will rest at a number greater than 2.
A two digit number is to be formed from the digits 0, 1, 2, 3, 4. Repetition of the digits is allowed. Find the probability that the number so formed is a - multiple of 4.
Cards marked with numbers 1, 3, 5, ..., 101 are placed in a bag and mixed thoroughly. A card is drawn at random from the bag. Find the probability that the number on the drawn card is less than 19.
A die has 6 faces marked by the given numbers as shown below:
| 1 | 2 | 3 | – 1 | – 2 | – 3 |
The die is thrown once. What is the probability of getting the smallest integer?
Which of the following cannot be the probability of an event?
Two dice are thrown at the same time. What is the probability that the sum of the two numbers appearing on the top of the dice is 13?
