Final answer:
To estimate the average monthly cell phone bill, you can calculate the mean of the typical monthly range provided, which results in an estimate of $100 per month. This approach doesn't account for customer-specific usage patterns that can affect the actual bill.
Step-by-step explanation:
To estimate the average monthly cell phone bill using the data provided, you will need to make several calculations based on the sample budgets, customer samples, and usage patterns provided.
First, you can look at the typical expenses associated with a cell phone plan detailed in the sample family budget provided. If a typical cell phone plan ranges from $50 to $150 per month, you can calculate an average by summing the minimum and maximum values and then dividing by two:
Average Cell phone Bill = (Minimum monthly cost + Maximum monthly cost) / 2
Average Cell phone Bill = ($50 + $150) / 2
Average Cell phone Bill = $100 per month
This calculation provides a rough estimate based on the provided information. To gain more accurate insights, you would need a detailed breakdown of plans and usage across the customer base, considering variables like overage charges for customers who exceed their allotted time as mentioned. Additionally, confidence intervals, such as the one that estimates 81-87.4% of city residents have cell phones, could be used for different demographics but would require more advanced statistical methods to apply to the average bill estimation.
Moreover, the exponential distribution mentioned in the lifetime of cell phones could be relevant if considering replacement costs over time, but this is not directly related to the monthly bill.