Question

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:	3.1086	3.1038	3.1043	3.1588	3.1274	3.0772
After​ 1983:	2.4999	2.5027	2.4909	2.4847	2.4824	2.4951

The mean weight of the pennies made before 1983 is

nothing

grams.

​(Round to five decimal places as​ needed.)

The median weight of the pennies made before 1983 is

nothing

grams.

​(Round to five decimal places as​ needed.)

The mean weight of the pennies made after 1983 is

nothing

grams.

​(Round to five decimal places as​ needed.)

The median weight of the pennies made after 1983 is

nothing

grams.

​(Round to five decimal places as​ needed.)

Does there appear to be a considerable difference in the​ means?

A.

​No, because the difference in the means is less than​ 5%.

B.

​Yes, because the difference in the means is less than​ 5%.

C.

​Yes, because the difference in the means is more than​ 5%.

D.

​No, because the difference in the means is more than​ 5%.

Click to select your answer(s).

Answer 1