Answer:
The probability that a viewer will be lost sometime in the next three months is 0.5683
Step-by-step explanation:
The probability density function that you need to use is the exponential density function because in the problem says that viewership is continuously declining at a rate of 28% per month.
An exponential density function is a function of the form:
[tex]f(x)=ae^{-ax}[/tex] where a a positive constant and is known as rate parameter.
To find that the probability that a randomly chosen viewer will be lost sometime in the next three months you use this
[tex]P(0\leq X\leq 3)=\int\limits^3_0 {0.28e^{-0.28x} } \, dx \\ P(0\leq X\leq 3)=-e^{-0.28*3}+e^{-0.28*0} = 0.5683[/tex]