Question 389662: Find the value of x so that the mean of {5x, 3/2x, x+9, -x} is -1
A. 2
B. 1/2
C. -1/2
D. -2
Thank you so much!!!!!!!!!
God Bless and Happy New Year!!!!!
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! Hint: To find the mean of a set of numbers, you simply add them up and divide by the number of numbers (in this case 4).
So this means that you just have to add up 5x, 3/2x, x+9, and -x and divide that sum by 4. Because you're forcing the mean to be -1, the entire expression will equal -1.
So in essence, you just need to solve the equation 
If you need more help, email me at jim_thompson5910@hotmail.com
Also, feel free to check out my tutoring website
Jim
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