If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Simple probability

You might need: Calculator,


Jake is going to call one person from his contacts at random. He has 30 total contacts. 16 of those contacts are people he met at school.
What is P(call a person from school)?
If necessary, round your answer to 2 decimal places.
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0.75
  • a proper fraction, like 1/2 or 6/10
  • an improper fraction, like 10/7 or 14/8
  • a mixed number, like 1 3/4
  • a percent, like 12.34%