# Probability

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##### Intros
###### Lessons
1. Introduction to Probability
• What is probability?
• How to write probability as a fraction, decimal, and percent?
• How to draw a tree diagram?
2. Introduction to statistics:
• What is mean?
• What is median?
• What is an outlier?
• What is mode?
• What is range?
3. What is a two-way frequency table?
4. How to read a two-way frequency table?
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##### Examples
###### Lessons
1. The following is the money raised in a school fund raising activity by each class in grade 9: $1 000,$580, $810,$1 050, $840 and$600. What is the mean, median and mode amount of money raised by these six classes?
1. Six hundred people were randomly selected in downtown. They were asked if they choose their clothes based on its comfort or style. The following is the results:
 Comfort Style Total Male 172 133 305 Female 115 180 295 Both 287 313 600
1. What is the probability that a person in the survey is a female?
2. What is the probability that a person chooses comfort over style?
3. What is the probability that a male chooses style over comfort?
4. Was there any assumption made in this survey?
###### Topic Notes
This lesson answers the question: What are the differences between mean, median and mode in statistics? Also, we will learn how to calculate the probabilities out of a two-way frequency table, and figure out the trends.