(a) The table below shows the age of customers who purchased a new phone plan from a telecom company. Construct a stem and leaf plot for the data. 1.5 marks 53 55 20 42 40 28 41 63 46 23 58 67 27 60 59 31 34 44 54 53 50 33 61 34 61 32 47 53 53 45 (b) Construct a frequency distribution for the data provided below using "20 to less than 30" as the first class. Approximate the sample mean and standard deviation from the frequency distribution. 1.5 marks Bin Frequency 20 4 30 5 40 7 50 9 60 5 (a) Draw a relative frequency histogram using the data above