Unit 7 Review

How many plays have members of the drama club acted in? Why is Yolanda's question a statistical question?

• A) The question will have a single answer.

• B) The question can be answered by collecting data that are not expected to vary.

• C) The question will have a numerical answer.

• D) The question can be answered by collecting data that are expected to vary.

René counts the number of blue marbles in 9 bags of marbles. The list shows his data: 22, 21, 33, 33, 27, 33, 40, 35, 35. What is the mean of the data? (Round to the nearest tenth.)

• 30.0

• 31.0

• 31.9

• 32.0

"How many days each week do my employees bring their lunch to work?" 

Select the THREE true responses.

• The shape of the distribution has two high points, at 2 day and 5 days.

• The data are spread from 1 day to 5 days.

• The mean is 2.75 and median is 2.5 days.

• The range is 5 days.

• The mean and median are both 3 days.

The frequency table uses tally marks to show the number of hours that volunteers work in a community garden during a month. The head gardener wants to have 90 volunteers work in the garden next month. How many more volunteers does the head gardener need?

• 10

• 34

• 30

• 40

What is the MAD of Archer's times, in seconds? Round your answer to the nearest tenth.

46.9, 46.8, 43.4, 51.0, 47.3, 48.5, 49.6, 48.1

• 1.6

• 47.7

• 8

• 12.8

Luna's mean time for completing the course is 43.6 seconds with a MAD of 4.3 seconds.

Galaxy's mean time in 49.6 seconds with a MAD of 2.1 seconds.

Select the correct answers that are true.

• Luna's times are more consistent because her lap time is less than the MAD of Galaxy's

• Galaxy's times are more consistent because her lap time is less than the MAD of Luna's

• A smaller MAD means the values are closer to the mean.

• A larger MAD means the values are closer to the mean.

A group of friends own sailboats and compete in a series of races. The speed of each sailboat is recorded, and the histogram shows the results. Is the mean sailboat speed less than, approximately equal to, or greater than the median sailboat speed?

Using the histogram data, complete the sentence below by selecting the correct answer

• The mean sail boat speed is less than the median sail boat speed.

• The mean sail boat speed is approximately equal to the median sail boat speed.

• The mean sail boat speed is greater than the median sail boat speed.

• None of these

The histogram shows the number of take-out orders received by a restaurant at different times of day. Which statement best describes the distribution?

• The distribution is symmetric.

• The distribution is skewed left.

• The distribution is skewed right.

• The distribution contains an outlier.

Stella surveys her coworkers to determine how many days most people worked last week. 

Her coworkers gave the following answers: 1, 4, 5, 3, 5, 2, 4, 5, 3, 2, 4, 5. 

She created the following dot plot to represent the data.

Which is true?

• The distribution is symmetric.

• The distribution is not symmetric

• The distribution is neither.

• The distribution is skewed.

Which statements are true about the box plots?

• Anderson's data is less varied because it has a lower IQR.

• Kang's data are less varied because it has a higher IQR.

• Anderson's data have a greater median than Kang's data.

• 
  The IQR is the same for both Anderson's data and Kang's data.

• The range is the same for both Anderson's data and Kang's data.