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The actual voltages of power packs labeled as 12 volts are as follows: 11.77, 11.90, 11.64, 11.84, 12.13, 11.99, 11.77. Referring to the above, a

The actual voltages of power packs labeled as 12 volts are as follows:

11.77, 11.90, 11.64, 11.84, 12.13, 11.99, 11.77.

Referring to the above, a 99% confidence interval for the mean voltage of the power packs is from __________ to __________.

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