There are 40000 homes in a city. These can be divided into 3 categories: Privatelyowned: 12000 Rentedfromcompanies: 8000 Rentedfrom private landlords: 20000. How many homes from each category should...

There are 40000 homes in a city. These can be divided into 3 categories:

• Privatelyowned: 12000


• Rentedfromcompanies: 8000


• Rentedfrom private landlords: 20000.

How many homes from each category should be included in a stratified sample of size 100?

Question 6: A professor took a sample of students` marks in the most recent Statistics test as follows:

1.0    1.0   2.0 4.0

Find the variance and standard deviation of the marks considering that you are dealing with a sample.