Probability Tes...

A fair coin is tossed a fixed number of items. If the probability of getting 7 heads is equal to that of getting 9 heads, then the probability of getting 3 heads is

A contest consists of predicting the results win, draw or defeat of 7 football matches. A sent his entry by predicting at random. The probability that his entry will contain exactly 4 correct predictions is

If these are n independent trails, p and q the probability of success and failure respectively, then probability of exactly r successes

A die is tossed thrice. A success is getting 1 or 6 on a toss. The mean and the variance of number of successes

If X follows a binomial distribution with parameters n = 6 and p and 4 (P(X = 4)) = P(X = 2), then p =

The value of C for which P(X = k) = Ck² can serve as the probability function of a random variable X that takes 0, 1, 2, 3, 4 is

In a bag there are three tickets numbered 1, 2, 3. A ticket is drawn at random and put back and this is done four times. The probability that the sum of the numbers is even is

In a trail the probability of success is twice the probability of failure. In six trails the probability of at least four successes will be

A probability that a bulb produced by a factory will fuse after 150 days of use is 0.05. What is the probability that out of 5 such bulbs none will fuse after 150 days of use

A dice is thrown 5 times then the probability that an even number will come up exactly 3 times is