<PRE><B>Question 257427</B>
So, we know that the average of 10 tests is 84. This is a total of 840 points.
We know the average of 8 tests is 85. his is a total of 680 points.
Let the highest score = H and the lowest score = H - 24.
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8 tests + 2 dropped tests = 10 tests. SO, we get
680 + 2H - 24 = 840.
solving for H, we get
2H = 840  - 680 +24
2H = 184
H = 92
H-24 = 68
HIs highest grade was 92.</PRE>