Simple Probability & Complement

Front

What is the formula for calculating probability?

Back

Probability (P) = Number of favorable outcomes / Total number of possible outcomes.

Front

If there are 14 girls and 12 boys in a class, how many total students are there?

Back

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

Front

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

Back

P(boy) = 12 boys / 26 total students = 6/13.

Front

What does P(NOT even) represent in probability?

Back

P(NOT even) represents the probability of selecting an odd number.

Front

If a die is rolled, what is the probability of NOT rolling an even number?

Back

P(NOT even) = 3 odd outcomes (1, 3, 5) / 6 total outcomes = 1/2.

Front

What is the probability of selecting a T-shirt that is NOT white if Drew has 5 black, 2 purple, and 1 orange T-shirt?

Back

P(NOT white) = 8 non-white T-shirts / 8 total T-shirts = 100%.

Front

What is the probability of selecting a white T-shirt if Drew has no white T-shirts?

Back

P(white) = 0 white T-shirts / 8 total T-shirts = 0%.

Front

If there are 14 girls and 12 boys in a class, what is the probability of NOT selecting a boy?

Back

P(NOT boy) = 14 girls / 26 total students = 7/13.

Front

What is the complement of an event in probability?

Back

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

Front

If P(A) = 0.3, what is P(NOT A)?

Back

P(NOT A) = 1 - P(A) = 1 - 0.3 = 0.7.