The Probability That Bill Does the Dishes

What is the method that the siblings use to decide who does the dishes each night?

• They take turns based on age

• They flip a coin

• They play a game to decide

• They draw names from a bowl

Tags

CCSS.RI.1.1

CCSS.RI.2.1

CCSS.RI.3.1

CCSS.RL.2.1

CCSS.RL.3.1

After how many nights of not being picked do the siblings start suspecting something fishy?

• 1 night

• 2 nights

• 3 nights

• 4 nights

Tags

CCSS.RI.2.1

CCSS.RI.3.1

CCSS.RL.1.1

CCSS.RL.2.1

CCSS.RL.3.1

What is the probability of Bill not being picked on a given night?

• 1/4

• 1/3

• 2/3

• 3/4

What is the probability of Bill not being picked three nights in a row?

• 0.125

• 0.25

• 0.375

• 0.42

Is it unlikely that Bill would not be picked three nights in a row?

• yes

• no

Tags

CCSS.7.SP.C.5

If Bill is not picked 12 nights in a row, what is the probability of this happening purely by chance?

• 0.032

• 0.125

• 0.25

• 0.375

What is the threshold probability that statisticians often use to determine if an event is happening purely by chance?

• 1%

• 2%

• 3%

• 5%

Tags

CCSS.HSS.MD.B.6

CCSS.HSS.MD.B.7

If Bill is not picked 20 nights in a row, what is the probability of this happening purely by chance?

• .001

• .01

• .1

• .5

Tags

CCSS.7.SP.C.5