http://www.ck12.org Chapter 5. Normal Distribution
From this data, we would estimate Cecil is taller than 73% of 12 year-old boys. We could also phrase this answer as
follows: the probability of a randomly selected British 12 year-old boy being shorter than Cecil is 0.73. Often with
data like this we use percentiles. We would say Cecil is in the 73thpercentile for height among 12 year-old boys in
Britain.
Part 2 How tall would Cecil need to be to be in the top 1% of all 12 year-old boys in Britain?
Here is a sketch:
In this case we are given the percentage, so we need to use theinvNormcommand.
Cecil would need to be about 173 cm tall to be in the top 1% of 12 year-old boys in Britain.