Suppose that,on average,electricians earn approximately 
dollars per year in the United States.Assume that the distribution for electrician's yearly earnings is normally distributed and that the standard deviation is 
dollars. Refer to Exhibit 7-2.What is the probability that the average salary of four randomly selected electricians is more than $50,000 but less than $60,000?
Definitions:
Like Terms
Algebraic terms that have the same variable parts and powers.
Collect
Refers to gathering or bringing things together from multiple sources.
Like Terms
Terms in an algebraic expression that have the same variables raised to the same power, which can be combined or simplified.
Operation Indicated
The process of performing the mathematical operation (such as addition, subtraction, multiplication, or division) as specified by the given problem.
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