# The heights of a certain group of adult parrots were found to be normally distributed. The mean height is 36 cm with a standard deviation of 7 cm. In a group of 1200 of these birds, how many would be more than 29 cm tall?

##### 1 Answer

1010

#### Explanation:

Let

First, standardise the normal by making it a

And in the normal distribution:

So

Using stat tables you can find that

So the expected no. birds taller than 29cm is