Anticipatory Set: Warm-up Transparency 2-6
The data below represents the heights in centimeters of plants in an experiment
4.5, 3.5, 1.1, 1.1, 5.6, 5.3, 1.5, 0.8, 3.9, 3.7
1. Use teh set of data to make a stem-and-leaf plot.
2. Which measure of central tendency best describes the data? Explain.
3. The test scores in Angel's history class are shown. Which value represents the median score for this class?
A. 85    B. 87    C. 88    D. 88.5

Lesson Notes

Probability: likelihood of an event occuring can be expressed as a fraction, decimal, or percent.
Simple Event: thing trying to measure or predict
Sample Space: set of all possible outcomes

Probability
P(a) = (number of favorable outcomes)/(total number of possible outcomes)
a: simple event

Example 1
a. Find the probability of rolling a number greater than 2 on a dice
b. a class contains 6 students with black hair, 4 with blonde hair, and 2 with red hair. Find...
   P(black)
   P(red or brown)
   P(not blonde)

**probability is somewhere between 0 and 1. (WHY?)

***diagram***
Equally Likely: when there are n outcomes, and the probability of each one is 1/n

Odds → another way to express the chance of an event occuring.

Odds: (number of ways an even can occur)/(number of ways an event cannot occur)
OR expressed as successes/failures

Odds can also be written as success : failures

Example 2: Find the odds of rolling a number greater than 2

Example 3: A card is selected at random from a standard deck of 52 cards. What are the odds against selecting a 2 or 3?

Example 4: Melvin is waiting to board a flight to Washington, D.C. According to the airline, the flight he is waiting for is on time 80% of the time it flies. What are the odds that the plane will be on time?

Homework p 98 #3, 18-48E, 64, 68, 72, 74