Transco Inc., headquartered in Chicago, Illinois, is a diversified industrial company. Founded in 1936, Transco operates through three principal business groups: Transco Railway Products, Transco Products Inc., and Advance Thermal Corp.
SATSUMA, Alabama -- Satsuma City Schools officials are seeking bids from vendors to buy two 2015 school buses to bolster an aging fleet. But new buses don't come cheap: Estimates range from $65,000 to $85,000, depending on how the bus is equipped. For example, buses used to transport special education students must have air conditioning.
The average weekly earnings of bus drivers in a city are $950 (that is ï­) with a standard deviation of $45 (that is ï³). If we select a random sample of 81 bus drivers and assume the number of bus drivers in the city is large compared to the sample size, what is the standard error of the mean?