Let's say I monitors my local aquifer (Edwards) using well J-17 over the past 8 summers (not counting this summer). I found that the mean water level/day is 680 ft above sea level, with a standard deviation of 30. Assuming a normal distribution, how do I find the probability that the aquifer level will drop to between 660 and 641 ft sometime this summer, at which time Stage 1 drought restrictions are in place?(adsbygoogle = window.adsbygoogle || []).push({});

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# Probability of a value of x, given a mean value of x bar and standard deviation s

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