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A sample of 4 bullfrogs is taken from a large population of frogs with normally distributed...

A sample of 4 bullfrogs is taken from a large population of frogs with normally distributed croaking volumes. If the sample of frogs has a mean croaking volume of x⎯⎯⎯=66.0979 dB with variance s^2=14.44, what is the probability that the population has an average croaking volume of μ=55 dB or more?

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