Statisticshard · Past Paper
A box contains 2 defective bulbs and 8 good ones. Two bulbs are drawn without replacement. Find the probability that both are defective.
A1/45
B2/90
C1/50
D1/25
✓ Correct Answer: A — 1/45
P = (2/10) * (1/9) = 2/90 = 1/45.
Share this question
More from Statistics
- What is the mean of first 10 multiples of 5?
- A number is chosen from 1 to 20. What is the probability that it is a prime number?
- If the mean of $a, b, c, d, e$ is 28, and the mean of $a, c, e$ is 24, what is the mean of $b, d$?
- In a distribution of 100 observations, the sum of observations is 500. If the sum of squares of observations is 3000, the mean is:
- The median of the data 13, 15, 16, 17, 19, 20 is: