Answer:
x = 12.6
Step-by-step explanation:
When you have one fraction equated to another one, the means-extremes property allows you to cross multiply, as follows:

can be rewritten as:
a*d = c*b
For this case:

5*x = 7*9
x = 63/5
x = 12.6
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<span>http://www.mathsteacher.com.au/year10/ch16_statistics/04_spread/24spread.htm
They summarise how close each observed data value is to the mean value.
</span> Go to the link above
Step-by-step explanation:
