Answer:
The first obe
Step-by-step explanation:
64; Line pq is correspondent with line ab and triangle PQR is 4 time as big as triangle ABC.
a) If f(y) is a probability density function, then both f(y) ≥ 0 for all y in its support, and the integral of f(y) over its entire support should be 1. eˣ > 0 for all real x, so the first condition is met. We have

so both conditions are met and f(y) is indeed a PDF.
b) The probability P(Y > 4) is given by the integral,

c) The mean is given by the integral,

Integrate by parts, with


Then



Answer:
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