Free GMAT Prep Hour: Visualizing Standard Deviation

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In this session, GMAT instructor Jeff Vollmer guides you through GMAT content and strategy. We rarely need to calculate Standard Deviation on the GMAT, but we do need to understand what Standard Deviation measures: the elative clusteredness of values in a set. With the number line as an aid, Jeff talks through a handful of Standard Deviation principles and problems to show just how helpful visualizing the spacings of values in a set can be.
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[@richardlera2863]

Thankyou. Best teacher I’ve found!

[@rishabhsinghal6831]

Hey Jefferey... I watch all your videos...You are so awesome

[@ashishsinha9035]

Very informative. Thanks a ton.

[@sharktank9810]

Thank you so much

[@CarmenHorse]

thank you ! if you add a new number within one standard deviation, the SD gets smaller, what if you add a new number that's an outlier or larger than the one SD?

[@sanskritibisht5033]

59:15 / 1:20:06
I chose C. WRONG. visualise!
C part: numerator and denominator trick. Even if there are outliers in A. The cluster could higher in the centre of A. So even though a few divations high, denom VERY HIGH so LOW SD. vala case is possible!

[@zrorarahul1985]

Very helpful video

[@manhattanprepgmat6791]

So happy to hear that!