The number of visitors to the Historic Museum for 20 randomly selected hours is shown below. 75 66 73 66 64 73 91 65 72 86 61 86 64 60 70 76 83 68 94 74 (a) Construct a stem and leaf display for these data. (2 m) (b) Construct a frequency distribution for these data using 60 as the starting point and 7 as the class width. (3 m) No. of Visitors Frequency (c) Draw an ogive to frequency distribution established in (b). (5 m)