The average score on the first Calculus exam is $76\%.$ The standard deviation is $8\%.20$ students took the exam. The average score on the second exam was $82\%,$ but only $16$ students took this exam.

For the first exam: What percentage of the students would you expect to have scored above $92\%?$

For the first exam: What percentage of the students would you expect to have scored below $68\%?$

What is the weighted average score across both exams?