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Flashcards in PROBABILITY Deck (96)
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1

What is probability?

The likelihood of an event happening.

2

What is the the difference between theoretical and experimental probability?

theoretical is from thinking of all of the possibilities and doing it with math, experimental is the #successes/total attempts you observe.

3

how do you find "probability"

(# ways you can be successful) / (# total ways possible)

4

What is the symbol that joins two sets together into one set?

A big U , stands for UNION

5

What is the symbol that just takes the overlap of two sets?

An upside down U, look like this: ∩, INTERSECTION

6

What do students forget about OR ?

The OR BOTH part. The union of A and B are all of the elements in A, in B and also the ones that are in BOTH.

7

Why does OR go with UNION, ex. A U B = A or B

Because you are part of the union as long as you are a part of A or B or BOTH.  

8

Why does AND go with INTERSECTION? A ∩ B = A and B

Because ONLY if you are a member of A and also a member of B, can you be a part of the intersection, A ∩ B

9

OR goes with______ [union or intersection]

union

10

AND goes with ______ [union or intersection]

intersection

11

UNION goes with ______ [OR or AND]

OR

12

INTERSECTION goes with _____ [OR or AND]

AND

13

What numbers can represent a probability?

Always between 0 and 1, examples: 0, .75, .05, 1, .35

14

What fractions can represent a probability?

Any fraction as long as the top is smaller than the bottom (or equal). IT CAN'T BE TOP HEAVY!

15

Can you have a probability of 3.5?

NO. probabilities are between 0 and 1

16

can you have a probability of 0.5?

Yes, that's 50%

17

can you have a probability of 3/5?

Yes, that's 60%

18

can you have a probability of 5/3?

NO... that is more than 1

19

How can you think of %

PER 100 (or, divided by 100)

20

If you have 3 pairs of shoes, two pairs of pants and 4 shirts.. how many outfits?

3*2*4= 24 outfits

21

How many cards in a deck of cards?

52

22

How many diamonds in a deck of cards?

13

23

What is the probability of randomly taking one card and getting a diamond from a deck?

13/52 or 1/4

24

What is the probability of randomly taking one card and getting a king from a deck?

4/52 or 1/13

25

What is the probability of randomly taking one card and getting a red card from a deck?

26/52 or 1/2

26

How many kings in a deck of cards?

4

27

what is the probability of getting 3 tails in a row flipping a coin?

1/2 x 1/2 x 1/2 = 1/8

28

What does A' mean?

The elements not in A

29

If A = { 1, 2 }, how many elements does A have?

two

30

If A = { 1, 2, 6} , what is n(A) ?

the number of elements in A. In this case, n(A)= 3