The Federal Communications Commission publishes a semiannual report on providers and services for Internet access titled High Speed Services for Internet Access. The report published in March 2008 included the following information on the percentage of zip codes with a specified number of high-speed Internet lines in service. (Note: We have used "10" in place of "10 or more,")

Let X denote the number of high-speed lines in service for a randomly selected zip code.
a. Find the mean of X.
b. How many high-speed Internet lines would you expect to find in service for a randomly selected zip code?
c. Obtain and interpret the standard deviation of X.

Transcribed Image Text:

Number Percentage Number Percentage of lines of zip codes of lines of zip codes 2 0.1 0.9 3.5 7.0 11.1 13.6 13.0 11.6 9.1 7.4 22.7 10