Probability & Statistics Mock Tests

The mean of 50 observations was 36. It was found later that an observation 23 was wrongly taken as 13. What is the correct mean?

A die is thrown once. What is the probability of getting a prime number?

A bag contains 5 red and 3 blue balls. Three balls are drawn at random. The probability that all three are of the same color is:

The probability that a leap year selected at random will contain 53 Sundays is:

If the mean and variance of a binomial distribution are 4 and 2 respectively, then the probability of getting exactly 1 success is:

Three cards are drawn from a well-shuffled deck of 52 cards. The probability that all three are of different suits is:

If the probability of an event happening is 3/7, the probability of it not happening is:

If the mean of a data set is 20 and standard deviation is 5, then the coefficient of variation is: