Probability

#1
I need help.

The probability that you will pass a test is .74. what is the probability that you will fail the test?

Is it .26?
 

jose

New Member
#2
You are right!
This is called "complementary events", in other words if even A happened is impossible that event B will also happen.

For example:
The probabability of rain for today is 0,4 (so if it rained is impossible that it did not rain, so they are complementay events)

P (rain) + P (no rain) = 1
P (no rain) = 1 - 0,4
P (no rain) = 0,6

This also applies to your question.

Cheers