A test consists of 10 true/false questions.
To pass the test a student must get 60% or better on the test.
If a student randomly guesses, what is the probability that he/she will pass the test?
The student must get: .6 right or 7 right or 8 right or 9 right or 10 right.
We have: .
We work out the separate probabilities . . .
and add: .