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Probability Descriptions
Calculating Probability
Compound Probability
Making Predictions
Experimental vs. Theoretical and Sample Space
100
Give an example of an event that would be certain. Show the probability in all three forms (fraction, decimal, and percent).
What is 100%, 1, or 1/1? Answers may vary...example: the Earth will orbit the sun in a year.
100
I have a bag of 40 starburst equally divided among the four colors. I pull out one starburst that is pink, eat it, and then draw another starburst. What is the probability that the next starburst will be pink? Show the probability in all three forms (fraction, decimal, and percent).
What is 9/39, 0.23, or 23%?
100
Calculate the probability of not drawing a heart card out of a standard deck. Show the probability in all three forms (fraction, decimal, and percent).
What is 3/4, 75%, or 0.75?
100
You flip a fair coin 275 times. Predict about how many "heads" you would get.
What is about 137 or 138?
100
Experimental or theoretical? I picked 3 pink starbursts out of the estimation jar without looking.
What is experimental because it is based on actual events?
200
Give an example of an event that would be considered improbable. Show the probability in all three forms (fraction, decimal, and percent).
What is 0.25, 25%, or 1/4? Answers may vary...example: There will be a tornado in Tualatin this year.
200
Using a standard deck of cards, I draw a card, look at it, and then replace it. The first card I draw is a jack of spades. What is the probability that I will draw the jack of spades again? Show the probability in all three forms (fraction, decimal, and percent).
What is 1/52, 0.02, or 2%?
200
Calculate the probability of not rolling an even number on a standard die. Show the probability in all three forms (fraction, decimal, and percent).
What is 50%, 1/2, and 0.5?
200
A spinner is divided so half is purple, one third is green, and one sixth is blue. If you spin the spinner 300 times, about how many times would it land on blue?
What is 50 times?
200
Experimental or theoretical? The probability of being picked for a Friday Hawk High Five raffle from the boxes in the Commons.
What is theoretical because it is based on numbers and calculations, not actual events?
300
Give an example of an event that is impossible. Show the probability in all three forms (fraction, decimal, and percent).
What is 0, 0/1, 0%? Answers may vary...example: a human being can physically be in two places at once.
300
Calculate the probability of rolling a number less than 7 on a standard die. Show the probability in all three forms (fraction, decimal, and percent).
What is 100%, 1, or 1/1?
300
Calculate the probability of getting heads or tails when flipping a fair coin. Show the probability in all three forms (fraction, decimal, and percent).
What is 100%, 1/1, or 1?
300
You are drawing cards out a deck one at a time, recording the suit of the card, and replacing the card in the deck. Predict how many club cards you would get if you repeat this process 45 times.
What is about 11 times?
300
Theoretical or experimental? The probability that Oregon will have a tornado this winter.
What is theoretical because it is not based on actual events?
400
Give an example of an event that is equally likely. Show the probability in all three forms (fraction, decimal, and percent).
What is 0.5, 1/2, 50%? Answers may vary...example: flipping a fair coin to get heads or tails.
400
I have a bag of starbursts with 80 inside equally divided among the four colors. I reach in the bag pull out a red one and then put it back in the bag. Then, I reach in the bag pull out a yellow one and eat it. I'm still hungry so I pull out an orange one and eat it too. What is the probability that I will draw an orange starburst the next time I reach the bag? Show the probability in all three forms (fraction, decimal, and percent).
What is 19/78, 0.24, and 24%?
400
I have a bag of candy. 45 pieces are Hershey's, 15 pieces are Butterfinger, and 30 pieces are Snickers. What is the probability of not getting a Hershey's when I reach into the bag and pull out a random piece? Show the probability in all three forms (fraction, decimal, and percent).
What is 50%, 0.5, and 1/2?
400
You are rolling a standard die. If you roll the die 700 times, predict how many times you would expect to roll a composite number.
What is about 233 times? (Remember 1 is neither prime nor composite, 2/3/5 are prime)
400
Name the sample space of rolling a die.
What is 1, 2, 3, 4, 5, and 6?
500
Give an example of an event that is probable. Show the probability in all three forms (fraction, decimal, and percent).
What is 75%, 3/4, 0.75? Examples may vary...It will rain on a given day in February in Oregon.
500
You are drawing cards out of a standard deck and laying them on your table. The first five cards you draw are an ace, a 5, a 6, a 7, and a jack. Calculate the probability that your next card will be a jack. Show the probability in all three forms (fraction, decimal, and percent).
What is 3/47, 6%, or 0.06?
500
Using a standard die, what is the probability of rolling an odd OR a prime number? Show the probability in all three forms (fraction, decimal, and percent).
What is 2/3, 66.6%, or 0.66? (Remember, 2 is a prime number even though it is even.)
500
You roll a standard die 3,000 times. Predict about how many times you would not roll a 3 or a 4.
What is about 2,000 times?
500
You and a younger sibling decide to roll a die to decide who has to take out the trash. If you roll at least one of your number, then you do not have to take out the trash. If you pick 1 and your sibling picks 3, would the odds be better if you rolled 2 dice instead of 1? Why? (Assume if you roll one of each number, its a tie and you roll again.)
What is no your odds do not improve because the sample space increased proportionally? The odds are still one in six.