Window Help unlv.instructure.com am C + 5 0 1 Attending Event STAT 391 1005 - 2022 Sprg Event (150050) Question 7 1 pts 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 4 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 a that make up roughly the middle 68% of the sampling distribution for random samples of 4 specimens? 7.8 to 8.1 7.85 to 8.15 6.9 to 8.9 7.1 to 9.5 1 pts Question 8 The level of nitrogen oxides (NOX) in the exhaust of cars of a particular model varies Normally with standard deviation o = 0.05 grams per mile MAY 2,413 12 O