Lesson-Variance of a Discrete Random Variable

Variance of a Discrete Random Variable

Multiple Choice

A variance of zero indicates that all values in a set are ______________.

• identical

• unique
• random
• different

Multiple Choice

• 0.76

• 0.9776

• 0.96

• 0.7996

Multiple Choice

If the variance of a discrete random variable is 4, what is its standard deviation?

• 1

• 2

• 3

• 4

Multiple Choice

A contractor is considering a sale that promises a profit of ₱92 000 with a probability of 0.7, or a loss (due to bad weather, strikes, and other factors) of ₱52 000 with a probability of 0.3. What is the variance of the profit?

• ₱4 354 560 000

• ₱4 293 440 000

• ₱3 293 440 000

• ₱25,000,000