Your grandma wants to review the distribution of the ages of her Facebook friends. The ages of a sample of her 20 Facebook friends are as follows:

first line61

77

38

49

53

39

70

56

62

The second line65

53

69

56

71

61

73

59

34

50

46

a.Construct a frequency, relative frequency, and cumulative relative frequency distribution for the data, using five class intervals. Please use the value 30 as the lower limit of the first class, and the value 80 as the upper limit of the final class. (5 marks)

b.Construct a frequency polygon using your answer to Part-a above(either manually or using Excel). (5 marks)