1. Algebra 1B – Name __________________________
Summary Statistics Notes Date ___________________________
MEAN Often referred to as the ___________
The mean is found by _____________________________________________________
______________________________________________________________________
Example: You earned the following scores on your Unit Tests this marking period: 80, 72, 83, 86. Find the mean of the scores.
MEDIAN
The median is found by ____________________________________________________
______________________________________________________________________
Example 1: Find the median of the following data set: 2, 5, 9, 11, 15, 19, 21, 27, 31.
Example 2: Find the median of the test scores: 80, 72, 83, 86.
MODE
The mode is ____________________________________________________________
Ex 1: Find the mode of the data set: 5, 6, 7, 7, 8, 9, 9, 9, 9, 10, 11
Ex 2: Find the mode of the data set: 7, 7, 11, 15, 15, 17, 18, 22
Ex 3: Find the mode of the data set: 1, 2, 3, 4, 5
RANGE The range is found by ___________________________________________
______________________________________________________________________
Example: Find the range of the data set: 5, 9, 1, 3, 10, 15, 27, 4

2. LOWER & UPPER QUARTILE
The lower quartile is ______________________________________________________
The upper quartile is ______________________________________________________
Median: _______
Lower Quartile: _______
Upper Quartile: _______
INTERQUARTILE RANGE (IQR)
The interquartile range is found by ___________________________________________
______________________________________________________________________
Lower Quartile: _______
Upper Quartile: _______
IQR: _______
Lower Quartile: _______
Upper Quartile: _______
IQR: _______
Let’s Put it all Together!
2, 6, 10, 22, 23, 10, 8, 10, 4, 4, 18, 14
Mean: ________
Median: _______
Mode: ________
Range: ________
Upper Quartile: _______
Lower Quartile: _______
IQR: _______

3. Algebra 1B – Notebook Entry #_____ Name __________________________
Probability Notes Date ___________________________
PROBABILITY __________________________________________________
P(Event) = ______________ We express probability as a ___________,
_____________ or _______________.
Example 1: Given a bag of marbles: 15 white, 3 red, 4 blue and 8 yellow. What is the probability…
a) of picking white?
b) of picking red?
c) of picking blue?
d) of picking yellow?
e) of not picking red?
f) of picking either yellow or blue?
COMPOUND PROBABILITY _______________________
____________________________________________________
Ex2. The spinner to the right is spun and a six-sided die is rolled.
Find the probability of the spinner landing on red and the die landing on a 5.
Ex3. I purchase a bag of M&Ms. There are 9 red, 11 brown, 10 blue, and 4 yellow M&Ms in the bag. After I pick one, I replace it before picking the next.
a) P(red, then blue) b) P(brown then yellow)
c) P(two yellows in a row)

4. Keystone Exam: Multiple Choice Questions
Ex4. Using a standard deck of cards (52 cards in a deck), and after one card is selected, it is not placed back in the deck.
a) P(heart, then spade) b) P(King, then an Ace)
c) P(two Aces in a row)
Keystone Exam: Multiple Choice Questions