A camp director is interested in the mean number of letters each child sends during his or her camp session. The population standard deviation is known to be 2.5. Then the minimum sample size needed if we wish to be 93 % confident that our estimate of mean is off by less than 1.2 is: None of the other options 15 21 O 11

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A: Please see below

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Q: ) Mr Ledwaba from Department of Health assumed that a random variable X is normal with mean 2 and…

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A: There are five windows.