12. The average of 7.5, 3.2, 11.3, 20.5 and x is
10. Find the value of x.
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x=7.5
Step-by-step explanation:
total=42.5+x
n=5
average=total/n= 42.5+x/5
10=42.5+x/5
50=42.5+x
50-42.5=x
7.5=x
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