(a) Ans: Points plotted at (4.5, 33) and (6.5, 35)
Locate 4.5 on the x-axis and 33 on the y-axis, then mark the point. Repeat for (6.5, 35).
(b) Ans: Positive
As revision time increases, marks also increase, indicating a positive correlation.
(c) Ans: Correct ruled line
Draw a straight line that best fits the data points, balancing above and below.
(d) Ans: 33.5 to 37.5
From the line of best fit at x=5.5, the estimated mark lies between 33.5 and 37.5.
