Statistics
posted by Bee .
What is the test scores of 4, X, 1, 2 and 5 have a mean of 10. What is the value
4 1 2 :10 15

Statistics 
PsyDAG
I assume you want the value of x.
mean = ∑x/n
10 = (4+x+1+2+5)/5
Solve for x.
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