All eight companies in the aerospace industry were surveyed as to their return on investment last year. The results are in percent) 10.6, 12.6, 14.8, 18.2, 12.0, 14.8, 12.2, and 15.6.
a. Calculate the range. (Round your answer to 1 decimal place.) Range %
b. Calculate the arithmetic mean. (Round your answer decimal places.)
c. Calculate the variance. (Round your answer to 2 decimal places.)