1. Objective: Find the mean, variance, and standard deviation of a discrete random variable
Standard DA-5 Lesson 5.2

2. Key words 1. mean 2. variance 3. standard deviation
4. discrete random variable

3. Let me do this
Example: Find the mean, variance, and s.d. of the number that appear when a die is rolled.
Solution: First construct prob.dist. X
P(X)

4. Let us do this
In a family of two children, find the mean, variance, and s.d. of the number of female children.
Solution: First construct prob.dist. X
P(X)

5. You do this
This distribution shows the number of trips of five nights or more that Europeans take per year. Find the mean, variance, and s.d. X 1 2 3 4
P(X)
0.06
0.70
0.20
0.03
0.01

6. class work/homework Textbook: pages 267-268 Solve the problems:
1) all problems from 2 thru 10
2) 12 thru 18 (even numbers)