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Thank you again, Colleen
January 12, 2026 at 8:09 PM
Reposted by The Calculator Guide
They can use the 991 in Binomial PD mode to find a single probability if they wish, or they can use the formula as given. For an inequality they are expected to use the calculator in Binomial CD mode.

From @casioeducationuk.bsky.social

education.casio.co.uk/article-bino...
Article - Binomial distribution formula: Definition, uses and examples - Casio Calculators
What does the binomial distribution formula involve and how can Casio calculators help with these problems?
education.casio.co.uk
January 6, 2026 at 6:57 PM