Probability

Vocab

100

A set of all possible sample points is called?

Sample Space

200

What is the Formula of a Combination?

C = N! / n! (N-n)!

300

What is the formula for a Permutation?

P = N! / (N-n)!

Calculations

100

Of five letters (A,B,C,D,E), two are selected at random. How many possible selections are there? (order doesnt matter)

C = 5! / 2!(3!) = 10 possible selections

200

How many ways can you assign 7 workers to 3 tasks? (order matters)

P = 7! / (7-3)! = 210 possible ways

300

Numbers 1-9 are in a box. If you draw 3 numbers, what is the number of possible outcomes? (Order doesnt matter)

C = 9! / 3!(6)! = 84 possible outcomes

Random

100

The probability assigned to each experiment outcome must be...

between zero and one

200

There are numbers 1-9 in a box. If you draw 3 times, what is the numer possible outcomes? (Order matters)

P = 9! / (9-3)! = 504 possible outcomes

300

There are numbers 1-9 in a box. If you select 3 at random, and the order matters, what is the number of possible outcomes if you allow repetition?

3 steps, 9 possibilities (9) ^ 3 = 729 possible outcomes