7/12 = 0.84
0.84/36 = 0.0233·
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.
Answer: The decimal is 0.583
Step-by-step explanation: