Are these One-variable Data notes free?

Yes. The full 3-page One-variable Data sheet is free inside CapCompass, which runs in your browser with no account needed.

What does the One-variable Data revision sheet cover?

Four summaries of one list, The three you compute, mean of n values, mean from a frequency table, range, the total, recovered from a known mean, Symmetric against skewed, Symmetric, Skewed to the right, A frequency table, read three ways, Worked: what one outlier does, Worked: a mean turned back into a total.

Is this for Digital SAT SAT Math?

Yes, it is written for the Digital SAT SAT Math syllabus.

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One-variable Data — Digital SAT SAT Math revision notes

A 3-page visual revision sheet for One-variable Data, written for Digital SAT SAT Math. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.

One-variable Data revision notes, page 1 of 3 — A preview of page 1 — all 3 pages open full size in the app.

One-variable Data in one look

one list of numbers, summarised by where it sits and how far it spreads

Four summaries of one list

centre is answered two ways. The MEAN is the total shared equally, the MEDIAN is the value in the middle once the list is sorted
the MODE is simply the value that occurs most often. A list can have two modes, or none worth naming
spread is answered two ways as well. The RANGE is largest minus smallest, and the STANDARD DEVIATION says how far a typical value sits from the mean
you are never asked to compute a standard deviation by hand here, only to say which of two lists has the larger one. That is a question about the picture, not about arithmetic

The three you compute

mean of n values x=Σ x_i/n
mean from a frequency table x=Σ f_ix_i/Σ f_i
range R=x_max-x_min
the total, recovered from a known mean Σ x_i=nx

Symmetric against skewed

Symmetric

mean and median land on the SAME value, 3 here
moving a value from one side to its mirror on the other changes neither
the mean is safe to quote as the typical value

Skewed to the right

the long tail drags the MEAN toward it, so the mean is about 2.09
the median barely moves and stays at 2, the middle value
the median is the safer summary when a tail is present

A frequency table, read three ways

score	frequency	score times frequency
1	5	5
2	10	20
3	3	9
4	2	8
total	20	42

Page 1 of 3. The full sheet, all 3 pages, opens free in the app.

What this One-variable Data sheet covers

Four summaries of one list
The three you compute
mean of n values
mean from a frequency table
range
the total, recovered from a known mean
Symmetric against skewed
Symmetric
Skewed to the right
A frequency table, read three ways
Worked: what one outlier does
Worked: a mean turned back into a total
Reading a distribution off the picture
Same centre, different spread
Symbols and terms
Which summary is the question asking for
Pacing and the calculator
Traps that cost points
Tricks that save time

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