Question 7 (7 points) 5 4) Listen Dr. Dentral is a dentist in London, Ontario and he has recorded the length of time 8 9 that patients brush their teeth and the number of cavities that person had last week. The data is shown below. 10 Year 2 4 5 Length of time brushing teeth in 2.1 1.7 .3 9 14 mins. Number of Cavities 2 5 3 1 Given: n =5 SumX =6.4 SumY = 11 SumXY =9 SumX2 =10.16 SumY2- 39 a) Calculate the Best-fit Line: Y = m(x) +b (Round "'m" and "b" to 2 Decimal places) (4 marks) b) Interpret the "m" value of your Best-Fit Line above - Be specific and use proper UNITS [2 marks] c/ Interpret the "b" value of your Best-Fit line above - Be specific and use proper UNITS [ 1mark]