Randomness Probability

The table above displays the 100 senators of the 112th U.S Congress on January 5, 2011, classified by political party affiliation and gender. A senator is selected at random from this group. Compute the following probability: The senator is a Democrat or a female.

• .42

• .56

• .47

• .53

A poll was taken of 121,973 people in the United States aged 15-44 to determine their health insurance status. The participants were classified by gender and by type of insurance coverage. The results were as follows. A person is selected at random. Compute the following probability: The person has private insurance or medicaid.

• .8417

• .0781

• .7657

• .6876

Which of the following shows how to determine P(skateboard or rollerblades)?

• 48/100 + 42/100 - 39/100

• 39/100 + 3/100 - 49/100

• 49/100 + 9/100 - 3/100

• 9/100 + 3/100 - 39/100

You flip a nickel three times.
Find the probability that all flips will land on tails.

• 1/2

• 1/4

• 1/6

• 1/8

What is the probability of randomly selecting a student who received a socks as a gift and was surprised?

A certain brand of TV has a 50% chance of being defective. Which model could be used to determine the probability that when two TVs are chosen, they will both be defective?

• spin a spinner with 4 equal sections

• roll a die twice

• flip a coin twice

• flip a coin, then roll a die

P(Pizza ∩ Water) =

• 62/182

• 120/400

• 58/400

• 140/400

The table above displays the 100 senators of the 112th U.S Congress on January 5, 2011, classified by political party affiliation and gender. A senator is selected at random from this group. Compute the following probability: The senator is an Democrat or an Independent.

• .42

• .53

• .002

• .50

Which of the following shows how to determine P(packers or male)?

• 75/150 + 90/150 - 50/150

• 75/150 + 35/150 - 25/150

• 50/150 + 40/150 + 25/150

• 90/150 + 50/150 - 75/150

Decide if the following outcome is random:
Flip a coin to decide who takes out the trash.
Is who takes out the trash random?

• Yes

• No