The result of tossing a fair die 120 times is summarized above. Find the value of x
-
A.
19 -
B.
20 -
C.
21 -
D.
22
Correct Answer: Option B
Explanation
12 + 20 + x + 21 + x-1 +28 = 120
2x + 80 = 120
2x = 120 – 80
2x = 40
x = 20
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