A box has 20 paper slips having a number from 1-20 written on it. One slip is chosen at random from the box. The probability that the chosen slip has a composite number on it, is:
Answer & explanation
Correct answer: option 3
Numbers on slips
$1,2,3,\dots,20$
Composite numbers between $1$ and $20$ are
$4,6,8,9,10,12,14,15,16,18,20$
Total composite numbers $=11$
Total possible outcomes $=20$
Probability
$P(\text{composite})=\frac{11}{20}$
The probability is $\frac{11}{20}$.