Your uncle wants to review the distribution of the ages of his Facebook friends. The ages of a sample of his 15 Facebook friends are as follows:

32

36

39

42

53

41

59

56

42

45

53

69

56

51

61

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 70 as the upper limit of the final class. (5 marks)

b.What proportion of your uncle's Facebook friends are between the ages of 30 and 60? What proportion of the Facebook friends are more than 60 years of age? What proportion of the Facebook friends are between 40 and 70 years old? (3 marks)

c.Construct an Ogive based on Part-a above (either manually or using Excel). (2 marks)