The table above shows the scores of a group of students in a physics test. If the mode is m and the number of students who scored 4 or more is n, what is (n, m)?
A final examination requires that a student answer any 4 out of 6 questions. In how many ways can this be done?
If the mean of five consecutive integers is 30, find the largest of the numbers
A bag contains 5 black, 4 white and x red marbles. If the probability of picking a red marble is 2/5, find the value of x
Find the variance of 2x, 2x-1 and 2x+1
