The average age of a Bunker Hill CC student is $28$ years old with a standard deviation of $4\mathrm{.}25$ years.

Assuming the ages of BHCC students are normally distributed:

a$.)$ What percentage of students are at least $34$ years old?

$\%($give percentage to two decimal places$)$

b$.)$ How old would a student need to be to qualify as one of the oldest $1\%$ of students on campus?

$($round age to one decimal place$)$