The table gives the relationship between the height, in metres, of a plant and the number of days it is left to grow.
Number of days(x)
10
20
30
40
50
60
70
80
Height (y)
1.0
1.1
1.2
1.4
1.6
1.8
2.0
2.3
(a) Using a scale of 2 cm to represent 0.5 units on the y- axis and 2cm to 10 units on the x- axis, draw a scatter diagram for the information. (b) Find \(\bar{x}\), the mean of x, and \(\bar{y}\), the mean of y, and plot \((\bar{x}, \bar{y})\) on the diagram. (c) Draw the line of best fit to pass through \((\bar{x}, \bar{y})\) and \((10, 1)\). (d) From graph, find the : (i) equation of the line of best fit ; (ii) height of plant in 75 days.
