The sex chromosomes determine the sex of a baby.
What are the sex chromosomes of a human male and of a human female?
The data in the table shows the ratio of males to females in a certain country:
| Ratio of males to females | |
|---|---|
| At birth | 105 males : 100 females |
| Average over the whole population | 92 males : 100 females |
What percentage of babies are male at birth? Give your answer to 1 decimal place.
In a maternity clinic, 820 babies are born in a year. Calculate how many of them are likely to be male.
On average, men do not live as long as women. How does the data in the table show this?