Question

The integers 11 to 30 are written on 20 cards. If one is selected at random, what is the probability that it is a prime number?

Answer 1

`P=(3)/(10)=0.3`

Step-by-step explanation

We want to find the probability that the number selected will be a prime number.

Between 11 and 30, there are 6 prime numbers:

`11,13,17,19,23,29`

The probability that the card selected is one with a prime number is the number of prime numbers divided by the total number (20).

Therefore, we have:

`\begin{gathered} P=(6)/(20) \\ \Rightarrow P=(3)/(10)=0.3 \end{gathered}`

That is the answer.