Vocab
An event that has ZERO chance of happening
Impossible
Rolling a standard die (1 - 6) and getting a 10
Impossible
Flipping a coin and getting tails
1/2
Flipping a coin twice and getting tails both times
1/4
You have 9 coins in your pocket. 5 dimes, 3 nickels and 1 quarter. What is the probability of picking a silver coin?
1
An event that will ALWAYS be true
Certain
Rolling a standard die (1 - 6) and getting a 2
unlikely
Rolling a standard die (1 - 6) and getting an even number
3/6 or 1/2
Rolling a standard die (1 - 6) and getting two consecutive 5s
1/36
Two or more events that do not rely on each other to have a successful outcome
Independent Events
Running tests of a theory and recording the results for a comparison
Experimental Probability
Rolling a standard die (1 - 6) and getting a number less than 7
Certain
Selecting the Ace of Hearts from a deck of 52 playing cards
1/52
Flipping a coin and rolling a standard die (1 - 6). What is the probability that you get Heads and a 6
1/12
You roll a cube which has the numbers 2, 4, 7, 9, 12 and 13 on it. What is the probability that you roll a prime number
1/2
The likelihood that an event will occur
Theoretical Probability
Rolling a standard die (1 - 6) and getting a number greater than 2
Likely
A bag of marbles contains 7 green, 5 red, 5 blue, 3 orange and 2 purple marbles. What is the probability of pulling out a red marble?
5/22
Two cards are chosen from a standard deck of 52 playing cards. What is the probability that both cards are Aces
1/221
Choosing all four kings consecutively from a standard deck of 52 playing cards.
4/52 * 3/51 * 2/50 * 1/49
0.000003694
Two or more events which the outcome of the first event effects the future events
Dependent Event
Rolling a standard die (1 - 6) and getting a number that has an odd number of letters in its name
likely
Selecting a face card from a standard deck of 52 playing cards
12/52 or 3/13
A bag of marbles contains 8 red, 7 green, 5 yellow, 3 purple and 2 orange marbles. What is the probability that you pull out two yellow marbles without replacement.
1/30
Rolling 5 dice and all of them show 6
1/6 * 1/6 * 1/6 * 1/6 * 1/6
1/7776 or 0.000128601