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

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Presentation transcript:

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

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

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)

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)

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

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