7th grade stats and prob

Ms. Sajewski surveyed her students on the number of book they read last summer. Which is NOT true?

• The mode number of books read is one
• The median number of books read is 1.5
• Ms. Sajewski surveyed 20 students
• The mean number of books read is 3.25

Cole spun the spinner twice. What’s the probability of the spinner landing on the 3 twice in a row?

• 1/4
• 1/36
• 1/6
• 2/3

Sama tracked the hours of sleep that she got over the course of a week: 10, 9, 7, 9, 9, 7, 6    Which is a reasonable prediction of the mean number of hours of sleep that Sama gets in a night?

• 7
• 8
• 9
• 10

• an equal chance or 50-50

• certain

• likely

• unlikely

• 196%

• 50%

• 100%

• 0%

How many outcomes are there with tossing a coin and rolling a die?

• 2

• 6

• 12

• 24

Which shows the sample space for flipping two coins?

• S = {H, T}

• S = {HH, TT}

• S = {HH, HT, TT}

• S = {HH, HT, TH, TT}

List the sample space for this experiment: A coin is tossed at the start of a basketball match.

• S = {HH, TH, HT, TT}

• S = {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}

• S = {H, T}

• S = {HH, TT}

What is the term used for the set of all possible outcomes in an experiment?

• Discrete

• Continuous

• Sample space

• Random variables

Which event is not a dependent event?

• Picking 2 students be line leader and door holder from a group of 20 students
• Picking 2 marbles from a bag without replacing the first marble
• Picking 2 blue crayons from a box
• Picking an earring, replacing it, then picking a 2nd earring