Given below are the last four digits of 18 random phone numbers of your local population

Given below are the last four digits of 18 random phone numbers of your local population.


3,036 4,435 3,803 8,424 8,064 4,405
8,732 2,912 7,772 8,080 3,154 5,368
5,060 1,949 4,050 3,071 6,314 4,028

Fill in the frequency table of the final digit of 18 randomly selected phone numbers.

Using the sample mean of the final four digits (9704 would lead to a mean of 5), compute the mean of the sample means. (Round your answer to 2 decimal places.)