HI6007 Statistics and Research Methods for Business Decision Making

HI6007 Statistics and Research Methods for Business Decision Making

Question 2.

The following data are the 40 days of umbrella sales from a store.                                         (8 Marks)

63	74	42	65	51	54	36	56	68	57
62	64	76	67	79	61	81	77	59	38
84	68	71	94	71	86	69	75	91	55
48	82	83	54	79	62	68	58	41	47

1. Construct a frequency distribution and a relative frequency distribution for the data.

(2 marks)

• Construct a cumulative frequency distribution and a cumulative relative frequency distribution for the data.                                                                         (2 marks)
  • Plot a relative frequency histogram for the data.                                      (1 mark)
  • Construct an ogive for the data.                                                              (1 mark)
  • What proportion of the grades is less than 60?                                          (1 mark)
  •  

Classes Frequency Relative Frequency Cumulative Frequency Cumulative Relative Frequency 30 – 40         40 – 50         50 – 60         60 – 70         70 – 80         80 – 90         90 – 100

2. What proportion of the grades is more than 70?                                      (1mark) Use the following class intervals to answer the above questions