The final exam scores in a statistics class were as follows: 90, 70, 63, 98, 95, 32, 54, 89, 84, 80, 68, 71, 77, 71, 83 Find the
2 answers:
Answer:
75
Step-by-step explanation:
The mean [average] of a set of data is "the sum of all the numbers divided by the number of numbers".
<em>How many numbers are in the data set?</em>
<em>15</em>
<u>So we simply add all of them up and divide by sum by 15.</u> Doing so gives us the mean:
Mean =
The mean is 75
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<h3>Answer: They're all the same</h3>
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Reason:
means we have 6 copies of "2" multiplied out as shown in choice B. That explains how A and B are the same, and we can say
The parenthesis are optional, but I find they're handy to count the '2's easier.
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Now notice that
So,
The last step is possible because we have two copies of multiplied together.
This shows that choice C is equivalent to A and B.
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Lastly,
The jump to the last step is possible because we have three copies of multiplied together.
This shows choice D is equivalent to the others.
All four expressions are the same.
They represent different ways to say the same number. That number being 64.