Statistics and probability

Question 1 of 10

A binomial distribution has n = 10 and p = 0.3. Its mean is

Question 2 of 10

The mean of x, 2x, 3x is 8. Find x.

Question 3 of 10

A committee of 3 is chosen from 5 men and 4 women. The number of committees with exactly 2 women is

Question 4 of 10

In how many ways can 5 people be arranged in a row?

Question 5 of 10

The standard deviation of a set of data is 3. What is its variance?

Question 6 of 10

In how many ways can a committee of 3 be chosen from 6 people?

Question 7 of 10

P(A) = 0.4, P(B) = 0.5 and P(A ∪ B) = 0.7. Find P(A | B).

Question 8 of 10

Two fair coins are tossed. The probability of getting two heads is

Question 9 of 10

A bag has 4 red and 6 green balls. Two are picked one after the other without replacement. Find the probability that both are red.

Question 10 of 10

How many diagonals does a polygon with 10 sides have?