2. The following information is available on the amount of time (in minutes) 100 customers were put on hold before their calls to a company's Customer Service BOO-number were answered: Note: this is grouped (histogram) data. Class # Class (minutes) it of Customers 0 and under 2 2 and under-4 6 and under 3 3 and under 10 - Total -m- 1 2 3 4 5 a) What is the approximate average amount of time customers were put on hold? (1 marks) b) What is the approximate standard deviation of the time customers were put on hold? (2 marks) c) What percentage of customers were put on hold for greater than 8 minutes? (2 marks) d) What percentage of customers were put on hold for 6 minutes or less? (1 marks) 7. Property taxes for an Ontario resident over the years are listed. Year (x): 2007 2008 2009 2010 2011 2012 Taxes (y): $2,900 $3,000 $3,150 $3,300 $3,400 $3,600 a) Draw/sketch a scatter diagram. (3 marks) b) Calculate the least squares equation (simple linear regression). Let 2007 = 1, 2008 =2 etc. (4 marks) c) Predict the property tax for the year 2020. (2 marks)