Chocokid (chocokid) wrote in thequestionclub,

So I missed one math class, and I have an exam tomorrow. I have the sample test, and there is one problem that I just cannot understand. I've looked through my math book (which is horrible, but I digress), and I just can't find what section it's from or anything.

This is the problem:

Compute the following probability for the standard normal random variable z.
P(z< - 0.64)

Can anyone show me how to figure that out? Or at least tell me what it's called so I could look it up online? I don't just want the answer, I want to know how to actually do the problem.
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