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?
First, standardise the normal by making it a
And in the normal distribution:
Using stat tables you can find that
So the expected no. birds taller than 29cm is