a group of 200000 people are surveyed from all over the world then what is the expected number of green eyed people in the sample?

Question

When looking at a person’s eye color, it turns out that 1% of people in the world has green eyes ("What percentage of," 2013). Consider a group of 200000 people are surveyed from all over the world then what is the expected number of green eyed people in the sample?

 

 

Answer 1

1% is 1 out of 100.  So if you surveyed 100 people, how many would you expect to have green eyes?  What if you surveyed 200 people?  How about 1000 people?  

 

Now think about how you got the answers to these sample cases and apply the same process to a group of 200000 people.