Probability Basic Concepts

A sports announcer claims that Sheila has a 90% chance of breaking the world record in the100 -yard dash.

Henry figures that if he guesses on a true–false question, the probability of getting it right is 50% .

The Right to Health lobby claims that the probability of getting an erroneous medical laboratory report is 0.40, based on a random sample of 200 laboratory reports, of which 80 were erroneous.