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The numeric value is correct. 13 divided by 31 equals 0.419 (rounded to the nearest thousandth) However the label used is incorrect. Calls divided by days must yield calls per DAY. the closest correct answer is .419 calls per day. To calculate an avergage number of calls per month would typically require a larger sample of months to get a meaningful number. The most you could assert by this sample is the the average calls per month is 13 since you only have one month of data. If the following month, for example you received 23 calls, then the formula would be total number of calls (13 + 23) divided by the number of months (2) which would be 36 divided by 2 or 18 calls per month.
It is hard to say how much a land line costs per month now. It depends on how much you use your land line. Most people now have cell phones so they don't even use land lines.
Boost Mobile has an unlimited text and talk plan for $50 a month if you want to go prepaid cell phone coverage. Verizon is the winner, according to Cnet.com of the best plans by providers.
The size of the home doesn't really matter. A cable connection to the internet usually runs around $60 a month, but can vary with package deals and incentives.
The average cost for posting a billboard on any major highway can run anywhere from $600.00 to $2,500 a month. They can even run higher depending on the size and the location.