Question

120 students took a chemistry test. 22 scored a 90.55 scored an 80, 12 scored a

70, 11 scored a 60, and 20 scored a 50. Calculate the weighted average of the test
scores.

Answer 1

The weighted average of test score is 74.

Step-by-step explanation:

Formula:

X = ∑xw/ ∑w

w x xw

22 90 1980

55 80 4400

12 70 840

11 60 660

20 50 1000

∑w = 120 ∑xw = 8880

X = ∑xw/ ∑w

X = 8880/ 120

X= 74