A hint to get started
Decide whether an interval is central
The heights of male CJCians are normally distributed with mean 169 cm and standard deviation 8 cm. Given that 20% have a height between 160 cm and cm, with , find d. Can we use invNorm(p,μ,σ,CENTER)?
CJC · Lecture · Pause and think
Identify the mean and take the square root of the variance.
Convert the event to an interval and sketch the shaded area.
Use normalcdf with lower bound, upper bound, mean and standard deviation in that order.