Heights of 10 year old girls follow an approximately normal distribution with mean of 54.4 and a standard deviation of 2.7 inches.
What proportion of 10 year old girls are shorter than 48 inches?
What is the first quartile of heights of 10 ear old girls?
What is the IQR of heights of 10 year old girls? (note you will need to find two endpoints of the distribution for your calculation)