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December 13th, 2016, 11:03 AM   #1
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Math Focus: Stat's!
Lightbulb "Shortcut" to the Mean of Tabular Data?

Hello All,

I'm going through a study guide for the Professional Level Entry Exam (PLE) for Civil Service, which includes some statistics and math problems. One question involves obtaining the mean from the following tabular data:




I'm pretty good with stat's, but I've never been especially good at "math". I know I can arrive at the mean by multiplying the frequency by the value in each sample, summing those and dividing by the number of samples (7). However, no calculator is allowed while taking the exam, and it seems this would take a lot of time to do long-hand.

Given that the test is timed, I'm wondering if there is a "shortcut" to the mean - one I don't know about or can't figure out - that gets around calculating it all out. I can create sort of a histogram in my head and guess, but I'm not comfortable with that level of accuracy.

Thanks in advance!

N1UK
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