Understanding Probability and Independence

A bag contains 5 red balls and 3 blue balls. If one ball is drawn at random, what is the probability that it is red?

Two dice are rolled. What is the probability that the sum of the numbers on the dice is 7?

A coin is flipped twice. What is the probability of getting two heads?

A box contains 4 green, 3 yellow, and 5 purple marbles. If one marble is drawn at random, what is the probability that it is not purple?

If the probability of event A is 0.7, what is the probability of event A not occuring?

• 0.3

• 0.7

• 0.5

• 0.2

A spinner is divided into 8 equal sections numbered 1 to 8. What is the probability of landing on an even number?

A bag contains 5 red balls and 3 blue balls. If one ball is drawn at random, what is the probability that it is orange?

A jar contains 10 black, 15 white, and 5 red balls. If one ball is drawn at random, what is the probability that it is either black or red?

A card is drawn from a standard deck of 52 cards. What is the probability that it is a heart or a king?