Advertisements
Advertisements
प्रश्न
There are 35 students in a class of whom 20 are boys and 15 are girls. From these students one is chosen at random. What is the probability that the chosen student is a boy.
उत्तर
Total number of students = 35
Number of boys = 20
Number of girls = 15
Let E1 be the event that the chosen student is a boy.
∴ P(choosing a boy) = P(E1) = `("Number of outcomes favourable to ""E"_1)/ "Number of all possible outcome" = 20/35 = 4/7`
Thus, the probability that the chosen student is a boy is `4/7`
APPEARS IN
संबंधित प्रश्न
A bag contains 3 white, 5 black and 2 red balls, all of the same shape and size. A ball is drawn from the bag without looking into it, find the probability that the ball drawn
a black ball.
In a single throw of a dice, find the probability of getting a number not greater than 4.
A dice is thrown once. Find the probability of getting a number between 3 and 8.
Write sample space ‘S’ and number of sample point n(S) for the following experiment. Also write events A, B, C in the set form and write n(A), n(B), n(C).
Two digit numbers are formed using digits 0, 1, 2, 3, 4, 5 without repetition of the digits.
Condition for event A : The number formed is even
Condition for event B : The number formed is divisible by 3.
Condition for event C : The number formed is greater than 50.
Write sample space ‘S’ and number of sample point n(S) for the following experiment. Also write events A, B, C in the set form and write n(A), n(B), n(C).
One coin and one die are thrown simultaneously.
Condition for event A : To get head and an odd number.
Condition for event B : To get a head or tail and an even number.
Condition for event C : Number on the upper face is greater than 7 and tail on the coin.
If two dice are rolled simultaneously, find the probability of the following event. The sum of the digits on the upper faces is 33.
A die is thrown. Write the sample space. If P is the event of getting an odd number, then write the event P using set notation.
There are 9 tickets in a box, each bearing one of the numbers from 1 to 9.
One ticket is drawn at random from the box.
Event A: Ticket shows an even number.
Complete the following activity from the given information:
Activity:
S = {__________}
n(S) = ____________
A = {________}
n(A) = ___________
Two coins are tossed simultaneously. The probability of getting at the most one head is ______.
If one coin is tossed, write the sample space ‘S’.
