Standard Deviation and Variance

Front

To find the _________ you add up all the numbers and then divide by how many numbers you have.

Back

Mean

Front

The masses of six children are 34.5 kilograms, 42.6 kilograms, 39.8 kilograms, 40.1 kilograms, 53.4 kilograms, and 33.8 kilograms. Find the mean mass.

Back

40.7 kg

Front

The number of pages that Carolyn wrote in her journal each day from Monday to Friday is shown below:
9, 8, 12, 6, 10
What is the mean number of pages she wrote per day?

Back

9

Front

What is the median number of miles Jenna cycled for the following data over 7 weeks: 36, 42, 28, 52, 48, 36, 31?

Back

36

Front

Which of the following is a measure of variability? mean, median, mode, standard deviation

Back

standard deviation

Front

All of the below sets have the same mean.
Set 1-Standard Deviation=3.1
Set 2-Standard Deviation=4.9
Set 3-Standard Deviation=1.7
Set 4-Standard Deviation=3.2
Which set of data probably has the points closest to the mean?

Back

3

Front

This data is normally distributed. What percent of the data is in the shaded region?

Back

50%

Front

Four data sets are shown below.
Set 1: {10, 19, 38, 50, 51}
Set 2: {5, 21, 26, 39, 51}
Set 3: {9, 38, 50, 50, 51}
Set 4: {5, 28, 28, 28, 51}
Which data set has the largest standard deviation?

Back

Set 1

Front

If the standard deviation of a data set is 4, what is the variance?

Back

The variance is $4^2 = 16$.

Front

What is the sample standard deviation of Ervin's scores: 155, 165, 138, 172, 127, 193, 142?

Back

20.94