Probability and Statistics

A jar contains 10 jellybeans: 2 red and 8 yellow. If one jellybean is selected at random, it is ________ that it is red.

A bowl holds 6 orange marbles, 5 green marbles, and 4 purple marbles. What is the probability of drawing an orange marble?

• Certain

• Likely

• Unlikely

• Impossible

A drawer contains 4 striped socks, 6 plain socks, and 3 polka dot socks. What is the probability of picking a star-patterned sock?

• Certain

• Likely

• Unlikely

• Impossible

Liam flips a coin 30 times. He records 16 heads and 14 tails. If he flips the coin 90 more times, how many tails should he expect?

• 40

• 42

• 44

• 46

Out of 12 candy pieces: 2 are mints, 5 are gumdrops, 3 are toffee, and 2 are lollipops. After 12 random picks with replacement, results were: mints-1, gumdrops-4, toffee-5, lollipops-2. Which candy had a lower experimental probability than expected?

• Mints

• Gumdrops

• Toffee

• Lollipops

Sarah rolled a number cube 18 times. Which result best matches the theoretical probability?

• Number 1 appeared 3 times

• Number 2 appeared 2 times

• Number 3 appeared 5 times

• Number 6 appeared 6 times

John has 1 yellow pen, 4 blue pens, and 5 black pens. What’s the probability of choosing a blue or black pen?

• 4/10

• 5/10

• 9/10

• 1/10

A researcher observes fish aged 3–8 years. What is the probability of randomly selecting a 6-year-old fish from the following data? (3:2 fish, 4:4 fish, 5:3 fish, 6:5 fish, 7:6 fish, 8:4 fish)

• 5/24

• 1/6

• 4/24

• 3/24

A basket contains 5 apples, 3 oranges, and 2 bananas. What is the probability of drawing a banana?

• 1/2

• 1/5

• 3/10

• 5/10

A coin is flipped 100 times and lands on heads 58 times. What is the experimental probability of getting heads?

• 0.42

• 0.50

• 0.58

• 0.62