We randomly select 110 fish from a reservoir and measure the length of them. The average length of the fish is 31 cm with a standard deviation of 2.79 cm. (a) Find a 90% confidence interval for the average length of all fish in the reservoir  .         ≤ U ≤ (b) Find a 95% confidence interval for the average length of all fish in the reservoir  .          ≤ U ≤ (c) Find a 99% confidence interval for the average length of all fish in the reservoir  .         ≤ U ≤

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