Probability

Front

What is probability?

Back

Probability is a measure of how likely an event is to occur, expressed as a number between 0 and 1.

Front

What is the probability of selecting a blue marble from Bag A?

Back

Probability = (Number of blue marbles in Bag A) / (Total number of marbles in Bag A) = 4 / (3 + 4 + 10) = 4/17.

Front

What is the probability of selecting a blue marble from Bag B?

Back

Probability = (Number of blue marbles in Bag B) / (Total number of marbles in Bag B) = 5 / (13 + 5 + 12) = 5/30.

Front

If you spin a spinner with 10 equal sections, what is the probability of landing on the number 3?

Back

Probability = 1/10.

Front

If you spin the spinner 90 times, how many times should you expect to land on the number 3?

Back

Expected number = Probability of 3 * Total spins = (1/10) * 90 = 9.

Front

What is the probability of drawing a red or black pen from a box containing 3 black, 7 blue, and 5 red pens?

Back

Probability = (Number of red + Number of black) / Total pens = (5 + 3) / (3 + 7 + 5) = 8/15.

Front

If a die is rolled 300 times, how many times would you predict a roll of a 1 or a 6?

Back

Probability of 1 or 6 = 2/6 = 1/3. Expected number = (1/3) * 300 = 100.

Front

What is the probability of getting a letter that is not A from a set of 8 letters?

Back

Probability = (Total letters - Number of A's) / Total letters = (8 - 2) / 8 = 6/8 = 3/4.

Front

What is a sample space in probability?

Back

A sample space is the set of all possible outcomes of a probability experiment.

Front

What is an event in probability?

Back

An event is a specific outcome or a set of outcomes from a probability experiment.