3 (a) In a survey, 50 students were asked how long they spent exercising during one particular week. The results are summarised in the table. (i) Calculate an estimate of the mean time each student spent exercising that week. (ii) During that week, the time Simon spent exercising is shown below. Tuesday 12.37 p.m. until 1.24 p.m. Thursday 8.57 a.m. until 9.42 a.m. Which interval is his time recorded in? (b) A gym has four different types of machines. Carol is going to draw a pie chart to show how many times the machines are used in one day. She has started to make a table. (i) Complete the table. (ii) Complete the pie chart.