Statistics Expected Value

HINT: Read carefully! And think about the TOTAL amount of money being gained or lost in each situation!

• $275

• $625

• $2,750

• $6,250

Given the probability model in the table below, what is the expected value of the random variable?
  X        50          20        5
P(X)     0.1         0.3      0.6

• 14

• 4.67

• 5

• 7.5

If the expected value is negative, are you expected to win?

• yes

• no

A game consists of rolling a colored die with three red sides, two green sides, and one blue side. A roll of a red loses. A roll of green pays $2.00. A roll of blue pays $5.00.   The charge to play the game is $2.00. What is the expected value

• $0

• -$0.50

• $.67

• $-1.50

Is this a probability distribution?

• No, the sum of p(x) does not equal 1.

• Yes, all p(x) are between 0 and 1.

• No, all p(x) are not between 0 and 1.

• Yes, the sum p(x) is 1.

Is this a probability distribution?

• No

• Yes

Determine which of the following distribution is NOT a probability distribution.

• A

• B

• C

• D

A random sample of traffic tickets given to motorists in a large city is examined.  The tickets are classified according to the race of the driver.  The results are summarized in the table provided.  Assuming H₀ is true, the expected number of Hispanic drivers who would receive a ticket is

• 10.36

• 11

• 11.84

• 12

What must be true about the expected values in a chi square test?

• greater than or equal to 2

• greater than or equal to 5

• greater than or equal to 10

• greater than or equal to 30

It is a function whose value is a real number determined by each element in the sample space.

• Experiment

• Event

• Random Variable

• Probability

Tags

CCSS.HSF-LE.A.1B