Simple Probability & Complement

Front

What is the definition of probability?

Back

Probability is a measure of the likelihood that an event will occur, expressed as a number between 0 and 1.

Front

What is the formula for calculating the probability of an event?

Back

P(Event) = (Number of favorable outcomes) / (Total number of outcomes)

Front

What does it mean when an event has a probability of 0?

Back

An event with a probability of 0 means that it is impossible for that event to occur.

Front

What does it mean when an event has a probability of 1?

Back

An event with a probability of 1 means that it is certain that the event will occur.

Front

What is the complement of an event?

Back

The complement of an event A, denoted as A', is the event that A does not occur.

Front

How do you calculate the probability of the complement of an event?

Back

P(NOT A) = 1 - P(A)

Front

If there are 14 girls and 12 boys in a class, what is the total number of students?

Back

Total students = 14 girls + 12 boys = 26 students.

Front

What is the probability of selecting a girl from a class of 14 girls and 12 boys?

Back

P(girl) = 14 / 26 = 7/13.

Front

What is the probability of selecting a boy from a class of 14 girls and 12 boys?

Back

P(boy) = 12 / 26 = 6/13.

Front

If the probability of an event is 2/5, what is the probability of its complement?

Back

P(NOT event) = 1 - P(event) = 1 - 2/5 = 3/5.