Math Cafe Inferences and Probability

Mary has a number cube labeled 2, 4, 6, 8, 10, and 12. She will roll the cube 100 times. About how many times could Mary expect the number cube to land on 8?

• 5

• 8

• 11

• 16

Maria will flip a coin 300 times and record her results. About how many times could Maria expect the coin to land on tails?

• 50
• 100
• 150
• 200

Greg has four different colored cards in a box: yellow, red, blue, and green. He randomly selects one card, records the color, and then replaces the card in the box. If Greg does this 300 times, how many yellow cards should he expect to select?

• 50
• 75
• 100
• 150

A spinner is divided into four equal sections labeled yellow, green, red, and blue. If the spinner is spun 40 times, what percentage of the spins should land on blue?

• 10%
• 25%
• 33%
• 40%

If a fair number cube numbered 1-6 is rolled 60 times, how many times will you most likely roll a 3?

• 3
• 6
• 10
• 20

Kris has a bag that contains only red marbles, green marbles, and purple marbles. Kris pulls a marble from the bag, records the color of the marble, and puts it back in the bag. She performs 25 pulls and draws 8 red marbles, 12 green marbles, and 5 purple marbles. Based on the data, about how many times would Kris pull a red marble if she performed 1,000 pulls?

• 200
• 320
• 330
• 470

Chad will spin a spinner that is divided equally into 3 sections labeled 1, 2, 3 600 times and record each result. About how many times should Chad expect the spinner to land on either 1 or 2? 

• 100
• 200
• 300
• 400

Ramon makes a spinner with 4 colors. He colors 25% of the spinner red, 15% blue, 40% orange, and the rest green. Ramon then spun the spinner. Which outcome would be most likely to happen?

• the spinner landing on green or red
• the spinner landing on green or blue
• the spinner landing on orange or red
• the spinner landing on orange or blue

Erin rolled a number cube with sides labeled 1 through 6. She rolled the number cube 400 times and recorded each result. About how many times could Erin expect to roll a 4?

• 70
• 100
• 130
• 150

Henry predicted that he would pick a red color card 1/5 of the time in his color card experiment. Henry picked a card, recorded the color then put the card back into the bag before picking the next. He picked cards at random 45 times. If Henry’s prediction is true, how many times will he pick a red color card out of the bag?

• 40
• 18
• 9
• 5