Each test grade in Sara's science class counts for 1/6 of the final grade. The final exam counts for 1/2. Sara's test scores are 72, 84, and 90. Her final exam score is 90.
What is Sara's final grade for the class?
A) 83
B) 86
C) 87
D) 89,
Multiply each test by its respective weight and add the results.
72*(1/6) = 12
84*(1/6) = 14
90*(1/6) = 15
90*(1/2) = 45.
12+14+15+45= 86, so answer B is correct.
