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27 Nov 2019

I measure a quantity many thousands of times, and I find that theaverage is
about 90.7 m/s, and that the standard deviation on an individualmeasurement is 2
m/s. Now, I take an additional 20 measurements, and take theaverage just of those
20 measurements. What is the probability that I will find that thataverage is either
greater than 91.6 m/s, or less than 89.8 m/s

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