Question

Over the past 100 days, the number of defective bulbs produced by a machine is given by the following.

No. of defective bulbs	0	1	2	3
Days	20	40	12	28

The probability that tomorrow's output will have no defect.

• A. 1/5
• B. 4/5
• C. 7/25
• D. 18/25

Answer 1

The correct option is A 1/5

Total number of bulbs $=100$

Number of days that have $0$ defective bulb $=20$

$P\left(A\right)=\frac{Numberoffavorableoutcomes}{TotalNumberofpossibleoutcomes}$

$\therefore P\left(A\right)=\frac{20}{100}=\frac{1}{5}$

Hence option $A$ is correct.