Final answer:
The average value for x in the given exponential distribution is 2.
Step-by-step explanation:
The average value for x in an exponential distribution can be calculated using the formula μ = 1/λ, where λ is the rate parameter of the distribution. In the given exponential distribution, the rate parameter is 9/18 or 0.5. Therefore, the average value for x is μ = 1/0.5 = 2.