1. The numbers of women's clothing chains in Canada for the years 2010 to 2017:

Year	2010	2011	2012	2013	2014	2015	2016	2017
Number	89	87	90	95	97	98	100	94

a. Calculate the arithmetic mean number of chains for the 8-year period.

2. The quality control section of a coffee packaging factory selects a sample of 8 bags with the following weights (in grams):

454.1	454.0	454.3	453.9
454.7	454.4	455.0	454.2

a. Compute the mean and median weight?

b. What are the variance and standard deviation?