Write and solve an equation to find the value of the variable. 104, 137, 154, 1

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Write and solve an equation to find the value of the variable.


104, 137, 154, 131, x; mean = 130

a.122

b.127

c.124

d.125

Apr 29th, 2015

You can write the equation by using the formula for an average - the average (mean) of a set of numbers is the sum of the numbers (so, 104+137+154+131+x)  divided by the number of numbers in the set (here, we have 5 total numbers).  Since we know the average is 130, we get:

(104+137+154+131+x)/5 = 130

104+137+154+131+x = 130(5)

526 +x  = 650

x = 650-526

x= 124

The answer is c, 124


Apr 29th, 2015

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