I think “Predicted delay that you have a 90% chance of remembering.” is very confusing.
How about “A period of time in which a card has a 10% chance of being forgotten.”?
Or “The time required for the probability of recalling a card to decrease to 90%”, but that’s pretty long.
Also, change “Average interval” below the chart to “Average stability”, and for retrievability, change “How likely you are to remember.” to “How likely you are to recall a card today.”
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