1. The mean wage is Rs. 75 per day, SD wage is Rs 5 per day for a group of 1000 workers and the same is Rs 60 and Rs 4.5 for the other group of 1500 workers. Find mean and standard deviation for the entire group.
2. Mention the characteristics of Statistics. Explain any two applications of Statistics.
3. Distinguish between primary and secondary data. What are the methods of collecting primary data?
4. Find Karl Pearson's correlation coefficient between the sales and expenses from the data given below:
|
Sales
(Rs. Lakhs)
|
50
|
50
|
55
|
60
|
65
|
65
|
65
|
60
|
60
|
50
|
|
Expenses (Rs. Lakhs)
|
11
|
13
|
14
|
16
|
16
|
15
|
15
|
14
|
13
|
13
|