# Introduction to probability

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##### Examples

###### Lessons

- Below is a probability model showing the weathers in fall in City A.

Weather

Probability

Rain

0.35

Snow

0.08

Sunny

0.16

Cloudy

0.41

- Each student in a class of 30 writes his or her name on a slip of paper. These slips of paper are folded and put in a jar. Half of these slips are blue and half are yellow.
- What is the probability that a blue slip will be picked? Write your answer as a fraction, a decimal, a ratio, and a percent.
- Rob, Jennie and Alice are in this class. What is the probability that one of these students' names will be picked? Write your answer as a fraction, a decimal, a ratio, and a percent.

- Jen and her friend spin the wheel to decide what fun activity they will do this afternoon.

- What is the probability that the spin will land on movie or swimming? Write your answer as a percent and decimal.
- What is the probability that the spin will not land on dancing or shopping? Write your answer as a percent and fraction.
- If they spin the wheel twice, what is the probability that the spin will land on soccer and frisbee? Write your answer as a percent and fraction.

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