Question

Steve has a 20-sided die with numbers from 1 to 20. What is the probability that Steve rolls a number that is 5 or below?

Answer 1

We have that the probability per side is 1/20

we have that the numbers are 5 or below 5 so it can be 5,4,3,2,1

$P=\frac{1}{20}+\frac{1}{20}+\frac{1}{20}+\frac{1}{20}+\frac{1}{20}$

then we sum

$P=\frac{5}{20}=\frac{1}{4}$

the probability is 1/4