Probability and Statistics 12.1 - 12.2

An athlete completed five timed trials of a 20 m sprint test. What is the mean?

• 3.90s

• 3.95s

• 4.00s

• 4.05s

What does a large standard deviation indicate?

• The data is clustered closely to the mean.

• The data is spread widely around the mean.

• The data is normally distrubuted.

• The data is not normally distributed.

A study compares the music preferences of students in band class with the music preferences of other students. What are the other students?

• the control group in an experiment

• the treated group in an observational study

• the treated group in a survey

• the control group in an observational study

What does standard deviation represent?

• Deviation of negative values from a mean.

• Deviation of positive values from a mean.

• Spread of the variability of data around a mean.

• Statistical significance of variation around a mean.

What is the median?

5, 22, 81, 16, 15, 22

Find the median of these numbers: 2, 57, 38, 42, 6

At Donald's Donuts the number of donut holes in a bag can vary. Help Donald find the mode.

(if there is no mode, type none)

12, 10, 10, 10, 13, 12, 11, 13, 10

Which measure of central tendency would be best to represent this data?

• mean

• median

• mode

The table shows daytime high temperatures for a week. Which measure of central tendency would be best to represent the data?

• mean

• median

• mode

Carissa calculates the average number of pineapples in 25 cans of pineapple.

• population

• sample