Which of the following is the correct description of the

Which of the following is the correct description of the term ‘sex ratio’ as used in context of the census?

1. Number of females per 1000 persons
2. Number of females in a sample of 1000 persons
3. Number of males per 1000 females
4. Number of females per 1000 males

Sex ratio is defined as the number of females per 1000 males. According to 2011 census, sex ratio in India is 943.