Put the data in a table, then ask Desmos for mean, median, or a regression. Do not retype a long average by hand. Regression is one of those tools, in regression in Desmos.
What to type
A list in a table column can be averaged, and a scatter can take y1 ~ mx1 + b. Mean, median, and mode as ideas are in mean, median, and mode. Standard deviation, when the question names it, is in standard deviation.
The testing build still does basic stats and turns off extras. What is missing is in disabled Desmos features. For a five-number set you can average faster in your head, skip the keypad, in when not to use Desmos.
The bottom line
Table the numbers, then let Desmos compute. A short list you can add in five seconds does not need the tool.
Start practicing
Start with a free diagnostic, then drill your weak spots with 15-question quizzes and track how you're doing across Reading, English, and Math. Compare plans whenever you're ready to go further.
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