A Point Estimate for a City's Water Use

A water utility serves $40{,}000$ households. It wants to know $\mu$, the mean monthly water use per household, but metering and auditing every home is far too slow.

So an analyst draws a simple random sample of 8 households and records last month's use, in cubic metres:

$14.2, \quad 9.8, \quad 17.5, \quad 12.0, \quad 8.6, \quad 15.3, \quad 11.4, \quad 13.9$

She will report the sample mean $\bar{x}$ as her point estimate of the population parameter $\mu$.

What value does she report?

Round your answer to 2 decimal places.