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Average of the means

If a population has a standard deviation of 18, what is the minimum number of samples that need to be averaged in order to be 95% confident that the average of the means is within 2 of the true mean?

A. 612

B. 18

C. 312

D. 36

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## Q : Probability that the first card is a face card

A standard 52-card deck is shuffled and 2 cards are picked, without replacement, from the top of the deck. The probability that the first card is a face card (Jack, Queen, King) and the second card is not a face card is