Which ordered pair is a reflection of (3, 7) across the x-axis?

The overview of the problem is listed in the segment below on the explanation.

Step-by-step explanation:

The given values are:

Sample mean,

The hypothesized mean value,

Population standard deviation,

As we know, the status of the test is as follows:

⇒  

On putting the values, we get

⇒      

⇒      

Now, even though this is a one-sided check, here so the p-value is measured as:

Consequently p-value > 0.05 the check isn't relevant so there is no data to suggest that perhaps the concentration of mercury fallen from 1980 until 2012.