A box of tickets has an average of 100 and sd of 20 four, Ask an Expert

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A box of tickets has an average of 100, and SD of 20. Four hundred draws will be made at random with replacement from this box.

a) Estimate the chance that the average of the draws will be in the range 80 to 120.

b) Estimate the chance that the average of the draws will be in the range 99 to 101. with work please.

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