Question

Question 17 (i)
(i) A lot of 20 bulbs contains 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective?

Answer 1

(i) Total number of outcomes = 20
Number of favourable outcomes = 4
Hence P (getting a defective bulb)
$=\frac{4}{20}=\frac{1}{5}$