Statisticshard · Past Paper
In a box, there are 10 red, 20 blue and 30 green marbles. 5 marbles are drawn. What is the probability that all are blue?
A20C5 / 60C5
B20 / 60
C1/5
D1/12
✓ Correct Answer: A — 20C5 / 60C5
Probability = (Number of ways to choose 5 blue) / (Total ways to choose 5) = 20C5 / 60C5.
Share this question
More from Statistics
- For a set of 11 observations arranged in descending order, which position is the median?
- If P(A) = 2/3 and P(not A) = x/9, what is the value of x?
- A card is drawn from a deck of 52 cards. What is the probability that it is a red face card?
- For a data set with N=15, what is the position of the median?
- What is the probability of getting no heads in 4 tosses of a fair coin?