Write and solve an equation to find the value of the variable 104, 137, 154, 131, x; meaan=130

x = 124. Since the mean (average) is calculated by adding all the sums up, then
one divides by the quantity of numbers that are present. So take the mean multiple by the number 5, which is the quantity of numbers present. You get 650 then subtract 104, 137, 154, and 131 and your left with the numeric value of x being 124.