The PH Measurements of Water Specimens from Various Locations Along

The pH measurements of water specimens from various locations along a given river basin are Normally distributed, with mean 8 and standard deviation 0.3. You take water specimens from four randomly selected locations on this river basin. Use the 68-95-99.7 rule to answer this question: What is the range of average pH measurements x̄ that make up roughly the middle 95% of the sampling distribution for random samples of four specimens?

A) 7.4 to 8.6
B) 7.7 to 8.3
C) 7.85 to 8.15
D) 7.925 to 8.075