Answer:
118.3 therms
Explanation:
Number of houses sampled (n)= 10
Sample values of the amount of gas used = 139, 122, 141, 103, 138, 118, 99, 125, 89, 109.
The point estimate for the true population mean (μ) is given by the average of the sample values:

The point estimate of μ is 118.3 therms.