Name________________________
THEORETICAL
PROBABILITY #1--KEY
Directions: Theoretical probability describes how likely it is that an event will happen. Use the probability chart below to decide whether each event below is impossible, unlikely, equally likely, likely, or certain to happen.
0 ¼ ½ ¾ 1
|_______________|_______________|_______________|_______________|
Impossible unlikely equally likely certain
likely
Example: A two sided coin is flipped and lands on tails. ½ --Equally likely
EVENT
PROBABILITY
1) A two-sided coin is flipped and lands on heads. ½ -- equally likely___
2) Roll a die and get a number greater than six. 0 – impossible ___
3) Spin a spinner numbered 1-8, and you land on a number less than 3. ¼ – unlikely ___
4) You will watch TV today. 1 -- certain __
5) Pick a blue marble from an equal number of blue, yellow, red, and green marbles. ¼ – unlikely ___
6) You will have fish for dinner tonight. ¼ – unlikely ??? ___
7) Pick an ace from a regular deck of cards. ¼ – unlikely ___
8) Pick a red card from a regular deck of cards. ½ -- equally likely___
9) Your class will go
on a field trip this year. ¾
-- likely __
10) Roll a die and get an even number. ½ -- equally likely___
11) Roll a die and get a number that is a factor of 30 ¾ -- likely __
12) It will snow in your town tonight. ¼ – unlikely ???___
13) Your birthday will fall on a Friday this year. ¼ – unlikely ___
14) Pick a purple marble out of a bag of red marbles. 0 – impossible ___
15) Picking a vowel from the letters in your school’s name. ¼ – unlikely ???___