21) Two tests are given to students in a class. Grades from these two tests show a correlation coefficient of 0.5. The average grade and standard deviation of the first exam are 80 and 5. The average grade and standard deviation of the second exam are 82 and 5. Data is distributed normally with no outliers. Data is homoscedastic and the relationship between the two grades seem to be linear. A student got 90 on his rst test. What is your predicted grade for his second test? A student got 85 on her second exam. What is your predicted grade for her rst test