# Math Help - Econ Math help

1. ## Econ Math help

Hello all, I have an attached Econ math question attached, it needs to be opened. Can someone show the formula for the very bottom question or how to solve it. I'm a little lost on it.

Much Thanks.

2. ## Re: Econ Math help

Hey Hugebart.

Hint: The z-score of a normal distribution is given by Z = (X-mu)/sigma where mu is the mean and sigma is the standard deviation.

You use that to calculate probabilities in terms of P(Z < z) and P(Z > z) = 1 - P(Z < z).

3. ## Re: Econ Math help

ok thank you for the formula, but I'm still lost, where do you plug the numbers in it, for the bottom question?