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A sample of 75 concrete blocks had a mean mass of 38.3 kg with a standard deviation of 0.6 kg. a. Find a 95% confidence

A sample of 75 concrete blocks had a mean mass of 38.3 kg with a standard deviation of 0.6 kg.

a. Find a 95% confidence interval for the mean mass of this type of concrete block. (Round the final answers to three decimal places.)

The 95% confidence interval is ( , ).

b. Find a 99% confidence interval for the mean mass of this type of concrete block. (Round the final answers to three decimal places.)

The 99% confidence interval is ( , ).

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