The following table shows the monthly unemployment rate in the United States from January 2011 until January 2013. These data can also be found in the Excel file titled US unemployment.xlsx. 9.1 9.0 8.9 9.0 9.0 9.1 9.0 9.0 9.0 8.9 8.6 8.5 8.3 8.3 8.2 8.1 8.2 8.2 8.2 8.1 7.8 7.9 7.8 7.8 7.9 Based on: http://www.bls.gov.

a. Calculate the mean.

b. Calculate the median.

c. Determine the mode.

d. Describe the shape of this distribution.

AppendixLO1