Post your question in the Comment section below, and we’ll answer it as fast as humanly possible.

- Video Course
- Video Course Overview - READ FIRST
- General GRE Info and Strategies - 7 videos (all free)
- Quantitative Comparison - 7 videos (all free)
- Arithmetic - 42 videos (some free)
- Powers and Roots - 43 videos (some free)
- Algebra and Equation Solving - 78 videos (some free)
- Word Problems - 54 videos (some free)
- Geometry - 48 videos (some free)
- Integer Properties - 34 videos (some free)
- Statistics - 28 videos (some free)
- Counting - 27 videos (some free)
- Probability - 25 videos (some free)
- Data Interpretation - 24 videos (some free)
- Analytical Writing - 9 videos (all free)
- Sentence Equivalence - 39 videos (all free)
- Text Completion - 51 videos (some free)
- Reading Comprehension - 16 videos (some free)

- Study Guide
- Office Hours
- Extras
- Guarantees
- Prices

## Comment on

Units of Standard Deviation## When the question asks for

## The question is asking us to

The question is asking us to identify all values that are more than 0.5 units of standard deviation BELOW the mean.

0.5 units of standard deviation BELOW the mean = 9 - (0.5)(4.2) = 6.9

0.6 units of standard deviation BELOW the mean = 9 - (0.6)(4.2) = 6.48. This means that 6.48 is more than 0.5 units of standard deviation BELOW the mean

Likewise, 0.7 units of standard deviation BELOW the mean = 9 - (0.7)(4.2) = 6.06. This means that 6.06 is more than 0.5 units of standard deviation BELOW the mean

Does that help?

## So, What happen with numbers

## The question does not ask us

The question does not ask us to identify values that are more than 0.5 units of SD AWAY from the mean. It asks us to identify values that are more than 0.5 units of SD BELOW (less than) the mean

## Thanks so much. Probability,

## im really amazed with ur

## Glad to help!

Glad to help!

## Hi! Can you use a proportion

## Most definitely!

Most definitely!

## Great exercise!. At first I

## how do you determine 6 as the

7.6 below , 12, mean 16.4 above.

## Tuttiam52 isn't saying that

Tuttiam52 isn't saying that the correct answer is 6.

With "Units of Standard Deviation (SD)" questions, we often look at units of SD ABOVE the mean and units of SD BELOW the mean.

This question asks for 0.5 units of SD BELOW the mean.

So, we must SUBTRACT 2.1 from the 9 (the mean)

For more on this see: https://www.greenlighttestprep.com/module/gre-statistics/video/808

## Add a comment