The following data has been collected on the number of times that owner-occupied and renter-occupied units had a water supply stoppage lasting 6 or more hours in the past 3 months.

a. Define a random variable x = number of times that owner-occupied units had a water supply stoppage lasting 6 or more hours in the past 3 months and develop a probability distribution for the random variable. Let x = 4 represent 4 or more times.

b. Compute the expected value and variance for x.

c. Define a random variable y = number of times that renter-occupied units had a water supply stoppage lasting 6 or more hours in the past 3 months and develop a probability distribution for the random variable. Let y = 4 represent 4 or more times.

d. Compute the expected value and variance for y. 

e. What observations can you make from a comparison of the number of water supply stoppages reported by owner-occupied units versus renter-occupied units?

Transcribed Image Text:

Number of Units (1000s) Number of Times Owner Occupied Renter Occupied 439 394 1 1100 760 221 92 249 98 4 times or more 120 111