Assign valuesx1, x2, x3, x4for Student's in-class participation, homework assignments, midterm exam, and final exam that maximizes student's expected overall grade.Assume his:

1)In-class participation is100% with probability 1.0, weighted byw1 = (15 +- x1)%;

2)Homework is 85%with probability 1.0, weighted byw2 = (25 +- x2)%;

3)Exam 1 is79%with probability 0.4 and84%with probability 0.6,weighted by w3 = (30 +- x3)%;

4)Exam 2 is86%with probability 0.3 and93%with probability 0.7, weighted by w4 = (30 +- x4)%.

Restrictions are:

x1 <= 3%, x2 <= 5%, x3 <= 10%, x4 <= 10%,

w1 + w2 + w3 + w4 = 100%

1) find each value x1, x2, x3, x4

2) write the formula for expected overall grade