For his long distance phone service, Dale pays a

1 answer:

3 0

Equation;
y=6+0.08x
Last month, Dale's long distance bill was
$13.92
so,
$13.92=6+0.08x
0.08x=$13.92-6
0.08x=$7.92
x=99 minutes

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The mean of a discrete variable is calculated as:

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So, if we call x the number of defective transistors in cartons, we can calculate the mean E(x) as:

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At the same way, the variance V(x) is calculated as:

$V(x)=E(x^2)-(E(x))^2$