This damn Stats course is the last class holding me back from finishing my UC transfer requirements so I can hopefully transfer to UCLA or UC Berkley. I'm working my ass off since math really isn't my thing, but some things are just killing me. Being as I don't have class untill Tuesday, nor have a tutor (trying to save some money but I may just have to bite the bullet) I'm resorting to AT . This may be really simple, but I'm just not getting it:

Assume the z scores are normally distributed w/ a mean of 0 and a standard deviation of 1.

Assume the z scores are normally distributed w/ a mean of 0 and a standard deviation of 1.

*If P(0 < z < a) = .3907, find a*

There are others, but I'm hoping if someone can help me with this, I can get the rest. Thanks in advance