Data and Statistics

The scores that Joni and Sally received on their first 7 assignments are shown. Which statement below is true?

• Sally’s median score is higher than Joni’s median score.

• Sally’s median score is the same as Joni’s median score.

• Sally’s median score is lower than Joni’s median score.

• The median scores cannot be determined.

Juanita surveyed a random sample of 20 students in the school band as to how many hours per week they practiced at home. The results are shown in the table below. Which of the following is a reasonable conclusion based on the mean number of hours per week the boys and girls each spent practicing.

• The girls generally practice slightly more than the boys.

• The girls generally practice much more than the boys.

• The boys generally practice slightly more than the girls.

• The boys generally practice much more than the girls.

Nadia is conducting an experiment where she repeatedly draws a marble from a bag without looking, records its color, and replaces it. She conducted 40 trials in the experiment, with the results shown below. If Nadia were to conduct the same experiment with 2,000 draws, approximately how many times could she expect to draw a yellow marble?

• 400

• 125

• 250

• 500

If Mary chooses a point in the square, what is the probability it is not in the circle? Express your answer as a decimal.

What percentage of the data is between 90 and 140?

• 25 %

• 50%

• 75%

• 100%

How many students scored 93% or less?

• 6

• 16

• 14

• 13

What is the mean of the following set of numbers: 4, 8, 12, 16, 20?

Mathematical Equivalence

ON

How is the data distributed in this histogram?

• Symmetrically

• Skewed Right

• Skewed Left

Cedric has 1 red pen, 1 blue pen, and 1 black pen in his desk. If he randomly draws two of them from the desk without replacement, what is the probability he will draw the blue and black pens?

Enter answer as a fraction.

Abdul surveyed a random sample of adults to find out how many hours per night they sleep. The results are shown below. 7,7,6,8,8,7,7,8,6,7,5,8,8,7,6,7,6,9,6,7 What is the mean number of hours of sleep for the population from which the sample was drawn?