Step-by-step explanation:
Given
Required (Missing from the question)
In an exponential distribution:
In the above equations:
Substitute 11 for E(x)
Now, we solve (a) to (d) as follows:
Solving (a): P(X>11)
Remove bracket
Solving (b): P(X>22)
Remove bracket
Solving (c): P(X>33)
Remove bracket
Here, we make use of:
So, we have:
Subtract 1 from both sides
Reorder the equation
Solve for x: