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Pennies made before 1983 are​ 97% copper and​ 3% zinc, whereas pennies made after 1983 are​...

Pennies made before 1983 are​ 97% copper and​ 3% zinc, whereas pennies made after 1983 are​ 3% copper and​ 97% zinc. Listed below are the weights​ (in grams) of pennies from each of the two time periods. Find the mean and median for each of the two​ samples, then compare the two sets of results.
Before​ 1983:
3.1588
3.1276
3.0773
3.1039
3.1086
3.1045

After​ 1983:
2.4994
2.4826
2.4906
2.5028
2.4958
2.4847

math   Statistics-And-Probability   
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