[BlindRUG] What's wrong with this data set? Why is R recognizing the Y variable but not the X variable?

[Amy Albin]

Hello,

I have 2 variables labeled "X and "Y". R is allowing me to do things
like mean(Y) it says 4.55. But when I type
mean(X)
It says: error in mean(X): object X not found

What's going on? Thank you.
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