Hello sagar,
Question 4 and 6 are answered previously, please check previous questions the discussion forum.
As far as question 5 is considered, the questioner is asking about the scale of measurement in colour of hair. As we all know colour can be black, red, white etcetera and these are qualitative and has no order. So, it has a nominal scale of measurement. Hope this helps. Let us know if you have any questions in this.
Best.
Ram,
Course support team,
IITM online degree programme.