Re: cant figure out this problem in my textbook...

kclive@xxxxxxxxxxxxx wrote: 
Well i already figured this out last night before going to sleep. All
you have to do is add up the number of executives (5), supervisors
(15), and production workers (80) which is 100 in all. Then, on part
(a), you take the current mean of 17800 and multiply by 100 to get
1780000. Then you add 15000 since you are raising 15 supervisors'
salaries by 1000, which then the total salary becomes 17950000. Divide
by 100 to get the new mean, which would be 17950. The median of 14500
will stay the same since that salary is in the range of the production
workers' salaries and not the supervisors' salaries; therefore the
median does not change.

Important question: Which salary - before or after the raise? (it can matter)

Incidentally, I think that's a great homework question: it needs a bit of thinking through, but if you understand the concepts, it's not too difficult.

Bob

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Bob O'Hara
Department of Mathematics and Statistics
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