n = 884But it took great effort to tabulate this many pennies. Could we get an estimate by checking fewer pennies? How about one penny? Five? Ten? One Hundred? Let's find out.

mean = 1986.359 (that is 12.641 years old is the average age)

standard deviation = 9.247 yearsOmitting the 1944 penny (an outlier.. the next oldest was 1959):

n = 883

mean = 86.407

standard deviation = 9.142

Randomly select a penny from the sample of 884 pennies, and type the score
in the box, recording the mean and standard deviation. Do this for the the
follwing sample sizes:

mean | S.D. | 2*S.D. | mean - (2*S.D.) | mean + (2*S.D.) | Hit? | |
---|---|---|---|---|---|---|

One penny | ||||||

Three pennies | ||||||

Five pennies | ||||||

Ten pennies | ||||||

15 pennies | ||||||

20 pennies |