Statisticseasy · Past Paper
A box contains 10 light bulbs, 3 of which are defective. What is the probability of picking a good bulb?
A3/10
B7/10
C1
D0.3
✓ Correct Answer: B — 7/10
Number of good bulbs = 10 - 3 = 7. Probability = 7/10.
Share this question
More from Statistics
- Which of these is the most frequent value?
- If the mean of $x_1, x_2, ... x_n$ is $\bar{x}$, what is the mean of $ax_1+b, ax_2+b, ... ax_n+b$?
- What is the arithmetic mean of the first five natural numbers?
- If the frequencies of classes 0-10, 10-20, 20-30 are 5, 8, 7, what is the 'more-than' cumulative frequency for class 10?
- A bag contains 5 red and 'n' blue balls. If the probability of drawing a blue ball is double that of a red ball, find n.