# T-84 Binomcdf and Normalcdf help!

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Hey Guys!

So the Math SL exam is tomorrow, and I can't find the answer to my question.

When we want to use normalcdf/ binomcdf, whats the difference if the question asks us to find the probability "less than" and "less than or equal to"

In continuous data, whats the difference in the inputs?

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Hi. There is no difference between less than vs less than and equal to in NORMALCDF.
In binomcdf, you want P(X <= 5) you do binomcdf (n, p, 5), if you want P(X < 10) you do binomcdf (n, p, 9) such that you add up to P(X = 9) and stop.

Reference: http://users.rowan.edu/~schultzl/TI/binomial_StatI.pdf
Good luck!

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1 hour ago, kw0573 said:

Hi. There is no difference between less than vs less than and equal to in NORMALCDF.
In binomcdf, you want P(X <= 5) you do binomcdf (n, p, 5), if you want P(X < 10) you do binomcdf (n, p, 9) such that you add up to P(X = 9) and stop.

Reference: http://users.rowan.edu/~schultzl/TI/binomial_StatI.pdf
Good luck!

What if the data is continuous for binom?

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Do you have an example? I don't think I have see anything where binomial is continuous.

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