Which data set does the box-and-whisker plot represent?
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
So the expression is: 
You can combine like terms, which are terms that contain the same variables raised to the same power. That means you can combine the two
. 
The other terms can't be combined.
Your final answer should be
.
You can combine like terms, which are terms that contain the same variables raised to the same power. That means you can combine the two
Your final answer should be