In the year 2010 a profit of book in x dollars follows the distribution which density function is f(x) = cx-3. There were 96 books in that year which profit exceeded 105 $. Estimate how many books profit over 2*105 ?
For cumulative distribution function F(x) = [itex]\int f(x)[/itex]
The Attempt at a Solution
I don't what to do. I tried to define c but I failed. I don't want direct answer but just some guidelines which help me to get started.