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Basic Probability
Addition rules
Multiplication rules
100
If a die is rolled one time, find the probability of getting a number greater than 4
What is 1/3 or .3333
100
If a die is rolled one time, find the probability of getting a number greater than 3 or an odd number
What is 5/6 or .8333
100
If 25% of US federal prison inmates are not US citizens, find the probability that 2 randomly selected federal prison inmates will not be US citizens
What is .063
200
If one card is drawn from a deck of cards, find the probability of getting a diamond
What is 1/4 or .25
200
If one card is drawn from a deck of cards, find the probability of getting a 6 or a spade
What is 4/13 or .3077
200
The Gallup Poll reported that 52% of Americans used a seat belt the last time they got into a car. If 4 people are selected at random, find the probability that they all used their seat belt the last time they got into a car.
What is .073
300
If two dice are rolled one time, find the probability of getting doubles
What is 1/6 or .1667
300
A couple has three children. Find the probability that they have all girls or all boys.
What is 1/4 or .25
300
If 28% of US medical degrees are conferred to women, find the probability that 3 randomly selected medical schools graduates are men.
What is 0.373
400
If two dice are rolled one time, find the probability of getting a sum greater than 9
What is 1/6 or .1667
400
At a convention there are 7 math teachers, 5 computer science teachers, 3 statistics teachers and 7 science teachers. If an instructor is selected at random, find the probability that a science or statistics teachers is chosen.
What is 5/11 or .4545
400
A flashlight has 6 batteries, 2 of which are defective. If 2 are chosen at random without replacement, find the probability that both are defective.
What is 1/15 or .0667
500
A couple has three children. Find the probability that they have all girls.
What is 1/8 or .125
500
At a particular school with 200 male students 58 play football, 40 play basketball, and 8 play both. What is the probability that a randomly selected male student plays neither sport?
What is 0.55
500
It is reported that 72% of working women use their computers at work. Choose 5 working women at random, find the probability that at least 1 doesn't use their computer at work
What is .807