In words, define the random variable X . A sample of 20 heads of lettuce was selected.

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In words, define the random variable X̅ .

A sample of 20 heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce was then recorded. The mean weight was 2.2 pounds with a standard deviation of 0.1 pounds. The population standard deviation is known to be 0.2 pounds.

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