The answer to this is 2000...
hope this helps and HAGD!
Direct Proof is the answer.
Answer:
Part A: 108
Part B: 125
Part C: 1.71 x 10^-4
Part D: 0.2
Part E: 0.040
Sorry for the wait, laptop is being slow :/
I hope this helps.
If <em>f(x)</em> is a density function, then its integral over the entire real line should be 1:

so yes, <em>f(x)</em> is indeed a density function.