The probability of a student passing any examination is $\tfrac{2}{3}$.If the student takes three examinations. What is the probability that he will not pass any of them?

In how many can 9 people be seated if 3 chairs are available?

In how many ways can a delegates of 3 be chosen 5men and 3woman, if at least 1man and 1 woman must be included?

What is the mean deviation of x , 2x, x +1, and 3x, if the mean is 2

5, 8, 6 and k occur with frequencies 3, 2, 4 and 1 respectively and have a mean of 5.7. Find the value of k

The pie chart above represents 400 fruit in display in a grocery store. How many apples are in the store?