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In a sample survey of 645 people, it was found that 516 people have a high school certificate. If a person is chosen at random, what is the probability that he/she has a high school certificate?
Total number of people
Number of people having high school certificate
Required probability
In a medical examination of students of a class, the following blood groups are recorded:
From this class, a student is chosen at random. What is the probability that the chosen student has blood group AB?
Total number of students
Number of students having blood group
Required probability
80 bulbs are selected at random from a lot and their lifetime in hours is recorded as under.
One bulb is selected at random from the lot. What is the probability that its life is 1150 hours?
Total number of bulbs = 80
Number of bulbs having life of 1150 hours = 0
Required probability = 0
In a survey of 364 children aged 19 – 36 months, it was found that 91 liked to eat potato chips. If a child is selected at random, the probability that he/she does not like to eat potato chips is
Total number of children
Number of children who like to eat potato chips
Number of children who do not like to eat potato chips
Required probability
Two coins are tossed 1000 times and the outcomes are recorded as given below:
Now, if two coins are tossed at random, what is the probability of getting at most one head?
Total number of outcomes = 1000
Probability of getting at most 1 head
= Probability of getting 0 head + Probability of getting 1 head
80 bulbs are selected at random from a lot and their lifetime in hours is recorded as under.
One bulb is selected at random from the lot. What is the probability that selected bulb has a life more than 500 hours?
Total number of bulbs = 80
Probability that selected bulb has a life more than 500 hours
To know the opinion of the students about the subject Sanskrit, a survey of 200 students was conducted. The data is recorded as under.
What is the probability that a student chosen at random does not like it?
Total number of students = 200
Number of students who does not like Sanskrit = 65
Required probability
A coin is tossed 60 times and the tail appears 35 times. What is the probability of getting a head?
Total number of times the coin is tossed = 60
Number of times tail appears = 35
So, the number of times head appears = 60 – 35 = 25
Required probability
It is given that the probability of winning a game is 0.7. What is the probability of losing the game?
Let E be the event of winning a game.
Then, P(E) = 0.7
We know that, P(E)+P(E’) = 1
where E’ is the event of losing a game.
0.7 + P(E’) = 1
P(E’) = 0.3
So, the probability of losing the game is 0.3.
In a cricket match, a batsman hits a boundary 6 times out of 30 balls he plays. What is the probability that in given throw, the ball does not hit the boundary?
Let E be the event where the ball does not hit a boundary.
The batsman hits a boundary 6 times.
So, he does not hit a boundary 30 – 6 = 24 times
A bag contains 16 cards bearing number 1, 2, 3,â€¦, 16 respectively. One card is chosen at random. What is the probability that the chosen card bears a number which is divisible by 3?
Total number of cards in the bag = 16
Numbers divisible by 3 are
Number of cards that bears numbers divisible by 3 = 5
Required probability
A bag contains 5 red, 8 black and 7 white balls. One ball is chosen at random. What is the probability that the chosen ball is black
Total number of balls in the bag
Number of black balls
Required probability
In 65 throws of a die, the outcomes were noted as under:
A die is thrown at random. What is probability of getting a prime number
Let E be the event of getting a prime number.
So,
2 appears 10 times, 3 appears 12 times and 5 appears 9 times.
So, the total number of times a prime number comes up is
In 50 throws of a die, the outcomes were notes as under:
A die is thrown at random. What is the probability of getting an even number?
Let E be the event of getting an even number.
So,
2 appears 9 times, 4 appears 7 times and 6 appears 8 times.
So, the total number of times an even number comes up is
The table given below shows the month of birth of 36 students of a class :
A student is chosen at random from the class. What is the probability that the chosen student was born in October?
Let E be the event of choosing a student born in October.
A die of thrown once. What is the probability of getting a number 4 or 5?
Probability
Find the probability that a vowel selected at random in the English alphabet is an P
Total vowels = 5
Determine the probability of three coins falling all heads up when tossed simultaneously
Total possibilities = 8
The probability of happening of an event is 45%. Find the probability of that event
When two dice are thrown what is the probability of getting a number always greater than 4 on the second dice?
Determine the probability of getting an even number when a die is rolled
Two numbers are chosen from 1 to 5. Find the probability for the two numbers to be consecutive
One card is drawn from a wellshuffled deck of 52 cards. Find the probability of drawing a 10 of a black suit
There are two 10’s of black suit (spade and club)
A bag contains 3 white and 5 red balls. If a ball is drawn at random, find the probability that it is red.
Given Number of red balls = 5,Number of white balls = 3
Total Number of Balls = 3 + 5 = 8 balls
Probability of getting a red ball =
From a normal pack of cards a card is drawn at random. What is the probability of getting a jack or a king?
What is the probability of getting a number greater than 2 or an even number in a single thrown of a fair die?
Find the probability that in a family of 3 children, there will be at least one boy
What is the probability that a non leap year contains 53 saturdays?
A bag contains 12 balls, out of which x are white. If one ball is drawn at random what is the probability that it will be a white ball?
Total balls
A coin is tossed 150 times and data is
Outcomes H, T
Frequency 30, 60
What is the probability of getting a head?