# (Answered)MATH225N Week 3 Assignment: Standard Deviation

Question

The following datavalues represent the daily amount spent by a family during a 7 day summer vacation.

Find the population standard deviation of this dataset:

\$96, \$125, \$80, \$110, \$75, \$100, \$121

Question

A large company is interested to know the variation in yearly sales for its salespeople. The dataset shown below is the yearly sales for a sample of 5 salespeople (expressed in thousands of dollars):

40, 60, 65, 70, 80

Find the variance for this dataset.

• Round the final answer to the nearest whole number.

# Question

Which of the following lists of data has the largest standard deviation?

# Question

Which of the following lists of data has the smallest standard deviation?

Question

Which of the data sets represented by the following histograms has the smallest standard deviation?

Question

A company is interested to know the variation in yearly sales amount for all 5 salespeople in the company.

The dataset shown below is the sales amount sold by the 5 salespeople in the company (expressed in thousands of dollars):

40,60,65,70,80

Find the variance for this dataset.

# Question

The following dataset represents the salaries for all six employees at a small start-up company.

Find the mean, variance, and standard deviation for this dataset of salaries (expressed in thousands of dollars):

55, 59, 63, 67, 71, 75

Question

Which of the data sets represented by the following histograms has the smallest standard deviation?

## Solution:

Question

The following datavalues represent the daily amount spent by a family during a 7 day summer vacation.

Find the population standard deviation of this dataset:

\$96, \$125, \$80, \$110, \$75, \$100, \$121