Nadya solves the equation 4x-4=20. Her work is shown below.
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You want to find the value of x for which the area under the curve to the left of x is 0.6. One way to do that is to create the cumulative distribution function (CDF) for the given PDF, then see where it is equal to 0.6.
Doing that, we find a = 5.
Doing that, we find a = 5.