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OpenStudy (anonymous):
The average of 100 measurements is 23 and the average of 50 additional measurements is 27. Which quantity is larger? A. the average of 150 measurements B. 25
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OpenStudy (anonymous):
25 is larger. you need to do [(100*23) + (50*27) ] / 150 which will give you 24.33333 which is less than 25.
OpenStudy (anonymous):
oh ok i did'nt know to add 50*27 thanks!
OpenStudy (anonymous):
no problem (:
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