The Average Weekly Earnings of Bus Drivers in a City $\mu$

question 98

Short Answer

The average weekly earnings of bus drivers in a city are $950 (that is $\mu$ ) with a standard deviation of $45 (that is $\sigma$ ). Assume that we select a random sample of 81 bus drivers.
a.Compute the standard error of the mean.
b.What is the probability that the sample mean will be greater than $960?
c.If the population of bus drivers consisted of 400 drivers, what would be the standard error of the mean?

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Definitions:

Field Discharge Resistor

A resistor used to safely discharge stored energy from the field winding of a motor or generator during shutdown.

Parallel

Referring to lines, paths, or components side by side that do not intersect or converge, often used in electrical circuits to indicate a specific type of connection.

Sufficient Power

Sufficient power refers to the minimum amount of energy required to properly operate a device or system according to its specifications.

Revolving-armature-type

Pertains to a design of electric machines where the armature, carrying the electrical input or output, rotates while the magnetic field source is stationary.