anonymous
  • anonymous
What is the mean of the set of numbers? {–9, –8, 4, –1} A. –5.5 B. –3.5 C. –2.8 D. 14 Question Resources
Mathematics
katieb
  • katieb
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SolomonZelman
  • SolomonZelman
The mean (or the average), is found by adding all the numbers in the set, and dividing by the number of these numbers.
SolomonZelman
  • SolomonZelman
In your case: \(\mu =\dfrac{(-9)+(-8)+(4)+(-1)}{4}\) where \(\mu\) denotes the mean.
anonymous
  • anonymous
the answer is 4

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SolomonZelman
  • SolomonZelman
What is the sum of all elements in your set, can you find that for me?
SolomonZelman
  • SolomonZelman
(-9) + (-8) + (4) + (-1) = ?
anonymous
  • anonymous
-14
SolomonZelman
  • SolomonZelman
yes, that is right.
anonymous
  • anonymous
so thats the answer
SolomonZelman
  • SolomonZelman
Now, lets get back to finding the \(\mu\) (the mean). \(\mu =\dfrac{(-9)+(-8)+(4)+(-1)}{4}=\dfrac{-14}{4}=?\)
anonymous
  • anonymous
-3.5
SolomonZelman
  • SolomonZelman
Yes, and this is exactly right!
anonymous
  • anonymous
so that is the final answer
SolomonZelman
  • SolomonZelman
yes
anonymous
  • anonymous
thank you so much
SolomonZelman
  • SolomonZelman
You are welcome!

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