Given the following data for a math class at this university: Class semester test average = 80corresponding standard deviation = 6Class final exam average =    70corresponding standard deviation = 8Correlation coefficient    = 0.6

(a) Use this data to write the equation of the regression line in the form y = mx +b where x = semester test grade and y = final exam grade. 

(b) Then use the computed regression line equation for this data to predict the final exam test score for a student who had a semester test grade of 80.