Probability & Statistics Review

TRUE OR FALSE: A bag of marbles has 1 yellow, 2 blue, 3 red, and 4 green marbles. The probability of picking a yellow marble is 0.

• True

• False

A probability of exactly 1 means what:

• Impossible

• Unlikely

• Equally likely

• Certain

Mrs. Barraza wants to know how many 7th grade students would like to start a math club. What sample would be the best choice for her survey?

• Asking the students in STEM class.

• Ask the 30 students with the highest grades.

• Ask random students from the whole school.

• Ask random students from the whole 7th grade.

The table shows the hair color of all the teachers in a meeting. What is the MEAN of these numbers?

• 1

• 4

• 13

• 16

At a concert, they are giving away free hats. 9 are pink, 15 are blue, 20 are red. If my favorite color is pink, what is the likelihood I will get a pink one?

• Impossible

• Unlikely

• Equally likely

• Likely

How many inches higher is the median of the girls' heights compared to the boys'?

• 1

• 2

• 66

• 67

How much larger is the interquartile range of the boys' heights compared to the girls?

• 2

• 3

• 5

A middle school has extra money and wants to know what students would prefer- new desks? or a new gym? What is the best sample for the survey?

• A random sample of the anime club.

• Ask random 7th graders only.

• Ask all the students on the basketball team.

• Ask every 20th student in the student directory.

50 students were asked what their favorite subject in school is. The results are shown here. What percent of students picked ELA?

• 25%

• 50%

• 75%

• 100%

A spinner is spun 10 times and here are the results. Which spinner was most likely used?

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