5. The ages of the residents of a retirement community are assumed to be normally distributed. \(15 \%\) of the residents are under 60 years old and \(5 \%\) are over 90 years old.

1. Using this information, find the mean and the standard deviation of the ages.
2. If there are 200 residents, find how many are over 80 years old. \section*{STATISTICS 1 (A) TEST PAPER 5 Page 2}