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posted by Ana .
Jason, a freshman at a local college, just completed 15 credit hours. His grade report is presented below.
Course: Calculus, Biology, English, Music, P.E.
Credit Hours 5, 4, 3, 2, 1
Grades C, A, D, B, A
The local university uses a 4 point grading system, i.e., A = 4, B = 3, C = 2, D = 1, F = 0. Compute Jason's semester grade point average.

I added his points: 2+4+1+3+4=14 and divided it by 5 to get 2.8 but that's the wrong answer.

Grade points times credit hours divided by total credit hours.
[(5*4) + (4*3) + (3*1) + (2*3) + (1*4)]/15 = ? 
The answer is 2.6 but I'm not sure how to get that

There are 71 students in all. The height of the 60to65 inch rectangle is about 0.0507. How many students are between 60 and 65 inches in height? Give a whole number answer.
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