Probability and Randomness Concepts

The video explores a scenario where four siblings decide who does the dishes by randomly picking names from a bowl. The oldest sibling, Bill, is suspected of cheating when he isn't picked for several nights. The video calculates the probability of this happening by chance, explaining the concept of probability and randomness. It discusses how statisticians use thresholds to determine if an event is likely due to chance or manipulation.

What method did the siblings decide to use to choose who does the dishes each night?

• Flipping a coin

• Playing rock-paper-scissors

• Rolling a dice

• Drawing names from a hat

Tags

CCSS.7.SP.C.7A

What is the probability that Bill is not picked on a single night?

• 1/4

• 1/2

• 3/4

• 1/3

How is the probability of Bill not being picked for three consecutive nights calculated?

• By adding the probabilities for each night

• By multiplying the probabilities for each night

• By subtracting the probabilities for each night

• By dividing the probabilities for each night

What is the probability that Bill is not picked for three nights in a row?

• 0.64

• 0.75

• 0.42

• 0.25

What is the probability that Bill is not picked for 12 consecutive nights?

• 0.75

• 0.42

• 0.12

• 0.032

Tags

CCSS.7.SP.C.5

At what probability threshold do statisticians often start to doubt randomness?

• 10%

• 1%

• 5%

• 15%

Tags

CCSS.7.SP.C.5

What might you conclude if the probability of an event happening by chance is below 5%?

• The event is likely random

• The event is likely not random

• The event is impossible

• The event is certain

Tags

CCSS.7.SP.C.5

What is the implication if Bill is not picked for 20 nights in a row?

• The probability is exactly 50%

• The probability is very low

• The probability is very high

• The probability is irrelevant

Tags

CCSS.7.SP.C.5

What does a low probability of an event suggest about the hypothesis of randomness?

• It proves the hypothesis

• It has no effect on the hypothesis

• It contradicts the hypothesis

• It supports the hypothesis

Tags

CCSS.7.SP.C.5

Why might the siblings start to suspect Bill of cheating?

• Because he is the oldest

• Because he is never picked

• Because he picks the names

• Because he does the dishes