Suppose that a radio tube inserted into a certain type of set has probability 0.2 of functioning more than 500 hours. If we test 4 tubes at random what is the probability that exactly three of these tubes function for more than 500 hours?

A word consists of 9 letters. 5 consonants and 4 vowels. Three letters are chosen at random. What is the probability that more than one vowel will be selected ?

A word consist of 9 letters; 5 consonants and 4 vowels. Three letters are chosen at random. What is the probability that more than one vowel will be selected?

A word consists of 7 letters : 4 consonants and 3 vowels. If three letters are chosen at random, then the probability that more than one vowel will be selected, is

A word consists of 9 different alphabets, in which there are 4 consonants and 5 vowels. Three alphabets are chosen at random. What is the probability that more than one vowel will be selected ?

A word consists of 9 different alphabets, in which there are 4 consonants and 5 vowels. Three alphabets are chosen at random. What is the probability that more than one vowel is selected?

Set S is the set of all points (x, y) in the coordinate plane such that x and y both integers with absolute value less than 4. If one of these points is chosen at random, what is the probability that this point will be 2 units or less from the origin ?

Statement-1 : Three natural number are taken at random from the set A={x:1 lt x lt= 100, x in N} the probability that the A.M of the numbers taken is 25 is equal to (""^74C_2)/(""^100C_3) . Statement-2 : Let A = {2, 3, 4 …. 20}. A number is chosen at random from set A and it is bound to be a prime number. The probability that it is more than 10 is 1/5 . Statement-3 : The probability of three person having the same date month for the birthday is 1/((365)^2) .

Suppose there are 500 misprints in a book of 750 pages. Assuming that the number of misprints per page is a poisson random variate. The probability that a page selected at random has more than one mis print is

The cumulative histogram above shows the distribution of mistakes 28 students in a French languge class made on a test. What is the probability that a student selected at random made more than 10 mistakes?

At a fete, cards bearing number 1 to 1000, one number on one card,are put in a box. Each player selects one card at random and that card is not replaced. If the selected card has a perfect square greater than 500, the player wins a prize. What is probability that (i) the first player winz a price? (ii) the second player wins a prize, if the first has won?