# Let's say that a consumer group wants to estimate what the mean of the electric bill for the month of July is for a single family homes in a big city. According to studies conducted in other cities, the standard deviation is said to be twenty five dollars. The group wants to estimate, with a 99% confidence. The mean bill for July to within ±5.00, then what sample size is needed?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Let's say that a consumer group wants to estimate what the mean of the electric bill for the month of July is for a single family homes in a big city. According to studies conducted in other cities, the standard deviation is said to be twenty five dollars. The group wants to estimate, with a 99% confidence. The mean bill for July to within ±5.00, then what sample size is needed?

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