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Have you learned about z-numbers and tables?

Yes, but I"m still a little confused.

These are the only one's that I have trouble with. I can do the % ones though.

Because for the % questions I can use invnorm on the calc.

My answer is 3.75. I did z= (4-3.45)/(.2)

However, that is not the correct answer. :/

Probabilities can't be greater than 3.75. :/

***sorry, can't be greater than 1, typo. Double check your steps.

And, you happened to plug in 3.45, when the mean was in fact 3.25.

It was a typo. Re-checking my equation right now.