1) A box of nails that come in different sizes is shown in Table 3.0 (a) Find the mode. (b) Calculate the mean. (c) Find the number of nails with length longer than it's mean. (d) Find the standard deviation. (15 marks) 2) Table 4.0 gives the pairs of measurements for two variables x and y. Table 4.0 x 5 9 12 l 15 13 l 20 3 s 3 9 1o 12 (a) Draw a scatter diagram for the data. (b) Find the regression line of y on x using the least squares method. (15 marks)