Statisticshard · Past Paper
A bag contains 6 red, 4 white and 8 blue balls. If 3 balls are drawn at random, what is the probability they are all blue?
A8/18
B56/816
C1/3
D7/102
✓ Correct Answer: D — 7/102
8C3 / 18C3 = (8*7*6)/(18*17*16) = 336 / 4896 = 7/102.
Share this question
More from Statistics
- If the mean of 5 observations is 10 and each observation is decreased by 3, the new sum is:
- The median of 4, 1, 3, 2, 5 is:
- If the mean of a, b, c is M, and (a+b+c+d)/4 = M, then d must be:
- Calculate the mode for the following data: 2, 3, 3, 5, 5, 5, 7, 7, 8, 8, 8. What can be said?
- Two coins are tossed simultaneously. What is the probability of getting exactly two heads?