Answer:
The 99% confidence interval for the population mean hours spent watching television per month is between 143.07 hours and 158.93 hours.
Step-by-step explanation:
We have that to find our
level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of
.
So it is z with a pvalue of
, so 
Now, find M as such

In which
is the standard deviation of the population and n is the size of the sample.

The lower end of the interval is the mean subtracted by M. So it is 151 - 7.93 = 143.07 hours
The upper end of the interval is the mean added to M. So it is 151 + 7.93 = 158.93 hours
The 99% confidence interval for the population mean hours spent watching television per month is between 143.07 hours and 158.93 hours.