You have been given a sample data set related to sales revenue and advertising expenditure in Dian packaging.

Sales Revenue ($ 000)	Advertising expenditure ($ 000)
35	7
37	8
45	10
47	12
51	12
55	11
60	15
72	16
75	18
74	20

Use the above data to answer the questions given below;

1. Calculate mean of sales revenue and advertising expenditure (2 marks)
2. Calculate Standard deviation of sales revenue and adverting expenditure (2 marks)
3. Calculate correlation coefficient between above two variables and interpret the meaning