On mine it ask for first an equation to model the problem. Next work backwards and rewrite the equation to find x. Then solve. 3
1 answer:
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The mean is and standard deviation is
. Then the variable
.
Use substitution , then the variable
.
The probability can be calculated in the following way:
for X=80, and
. From the diagram
.
Conclusion: if 188 students take the exam, then 188·0.84=157.92 (157) would receive a score above 80