Introduction to Binomial and Discrete Distributions
STAT 150

Spring 2015
RulesforMean:
Rule1:IfXisaRVandistransformedbyconstantsa&b:
a+X
a+X=_,
bX
bX=_, and
a+bX
a+bX=_.
Rule 2: If X and Y are RV's and combined then:
X+Y
X+Y=_ and
XY
XY=_.
RulesforVariance:
Rule1:IfXisaRVandistransformedbyconstantsa&b:
2
X
2a+X=_,
2
2
2
2
b
Introduction to Binomial and Discrete Distributions
STAT 150

Spring 2015
Rockford High School
AP Statistics
Chapter 7 Note Packet: Random Variables
Mrs. Shutich
Website: www.mrsshutich.weebly.com
Email:
tshutich@rockfordschools.org
20142015
Examples of random variables:
number of heads in 4 coin tosses
number of games to win
Introduction to Binomial and Discrete Distributions
STAT 150

Spring 2015
Name_Date_Score_/10
AP Statistics
Due:_
Chapter 7 Reading Notes
Chapter 7: Random Variables
Key Vocabulary:
random variable
discrete random variable
probability distribution
probability histogram
density curve
probability density curve
continuous random v
Introduction to Binomial and Discrete Distributions
STAT 150

Spring 2015
Practice Test 7 Solutions
7A
7D
1. c
5. b
7. b
2. c
6. e
8. b
3. d
7. b
9. d
4. c
8. d
10. e
9.
(a) X=# of people who will seek treatment for the flu during any given hour at an emergency room.
(b) X = 1.87
(c) 2X = 1.1933; X = 1.092
10.
$1.06
12.
0.0013