A bag contains 9 discs of which 4 are red, 3 are blue and 2 are yellow.The discs are similar in shape and size. A disc is drawn at random from the bag.Calculate the probability that it will be either red or blue.
A bag contains 9 discs of which 4 are red, 3 are blue and 2 are yellow.The discs are similar in shape and size. A disc is drawn at random from the bag.Calculate the probability that it will not be red?
A bag contains 9 discs of which 4 are red, 3 are blue and 2 are yellow.The discs are similar in shape and size. A disc is drawn at random from the bag.Calculate the probability that it will be red?
A card is selected from a pack of 52 cards.Calculate the probability that the card is an ace of spades
One card is drawn from a well shuffled deck of 52 cards. If each outcome is equally likely, calculate the probability that the card will be not a black card
One card is drawn from a well shuffled deck of 52 cards. If each outcome is equally likely, calculate the probability that the card will be not an ace
One card is drawn from a well shuffled deck of 52 cards. If each outcome is equally likely, calculate the probability that the card will be a diamond
Three coins are tossed once. Let A denote the event “three heads show”, B denote the event “two heads and one tail show”. C denote the event “three tails show” and D denote the event ‘a head shows on the first coin”. Which events are compound?
Three coins are tossed once. Let A denote the event “three heads show”, B denote the event “two heads and one tail show”. C denote the event “three tails show” and D denote the event ‘a head shows on the first coin”. Which events are simple?
Three coins are tossed once. Let A denote the event “three heads show”, B denote the event “two heads and one tail show”. C denote the event “three tails show” and D denote the event ‘a head shows on the first coin”. Which events are mutually exclusive?
Two dice are thrown and the sum of the numbers which come up on the dice is noted. Let us consider the following events associated with this experiment
A: ‘the sum is even’.
B: ‘the sum is a multiple of 3’.
C: ‘the sum is less than 4’.
D: ‘the sum is greater than 11’.
Which pairs of these events are mutually exclusive?
If E_{1} , E2, E3,......... En are n events of a sample space S & if E UE 2 I E 3 ..........U E_{n} = S then events E_{1}, E_{2}, E_{3} ,......,E n are called
Consider the experiment of rolling a die. Let A be the event ‘getting prime number’, B be the event ‘getting an odd number’. Write the set representing the event A but not B
Consider the experiment of rolling a die. Let A be the event ‘getting prime number’, B be the event ‘getting an odd number’. Write the set representing the event A or B
If S = {HHH, HHT, HTH, THH, HTT, THT, TTH, TTT}
and A={HTH, HHT, THH} then {HHH, HTT, THT, TTH, TTT} is called :
An experiment is called random experiment if it satisfies
- It has more than one possible outcome.
- It is not possible to predict the outcome in advance
When a coin is tossed it may turn up a head or a tail but we are not sure which one of these results will actually be obtained. Such experiment are called __________
A jar contains 24 marbles, some are green and others are blue. If a marble is drawn at random from the jar, the probability that it is green is 2/3. Find the number of blue balls in the jar?
A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball. Determine the number of blue balls in the bag?
Ram rolling a fair dice 30 times.
What is the expected number of times that the dice will land on an odd number?
Ram rolling a fair dice 30 times, What is the expected number of times that the dice will land on a 3?
There are 50 mangoes in a basket, 20 of which are unripe. Another basket contains 40 mangoes, with 15 unripe. If we take one mango from each basket, what is the probability of both being unripe?
From all two-digit numbers with either digit 1, 2 or 3 one number is chosen. What is the probability of both digits being the same?
A box contains four slips numbered 1, 2, 3, 4 and another contains three slips numbered 1, 2, 3. If one slip is taken from each, what is the probability of the product being even?
A box contains four slips numbered 1, 2, 3, 4 and another contains three slips numbered 1, 2, 3. If one slip is taken from each, what is the probability of the product being odd?
The average of five numbers a, b, c, d and e is 17.2. The average of the numbers b, c and d is 15. If a is equal to 10, find the number e.
The average of two numbers M and N is 104 when M is increased by 14. The average of M and N is 43 when N is made equal to M. What is the value of N?
The average age of a husband and his wife at the time of their marriage was 25 years. After 7 years, the average age of the husband, wife and his son is 22 years. What is the age of the son at that time?
Eight persons went to a bar. Seven of them spent Rs. 800 each and 8th person spent Rs. 210 more than the average expending of all the 8 persons. What was the total money spent by them?
Of the three numbers, the first number is two-thirds of the second number. The second number is one-fifth of the third number. The average of these three numbers is 35. Find the largest number?
The average age of 50 teachers of a school is 66 years and the average age of 60 teachers of another school is 55 years. What will be average age of teachers of both the schools together?
The average age of a sports team of 15 members is 23.4 years. A new member joins the team and the average age now becomes 23 years. The age (in years) of the new member is:
The average of two numbers A and B is 20, that of B and C is 19 and C and A is 21. What is the value of A?
A batsman has a definite average for 11 innings. That batsman scores 120 runs in his 12th innings due to which his average increased by 5 runs. Accordingly, what is the average of the batsman after 12 innings?
Average of five numbers is 12. But the average of three of these is 10. The average of the rest two numbers is
A student’s marks were wrongly entered as 93 instead of 39. Due to that, the average marks for the class got increased by 1. Find the number of students in the class.