Question

Given a standardized normal distribution with a mean of 0 and a standard deviation of 1, what is the probability that z is less than 1.57?

Answer 1

Since this is the standard distribution, you can look up the value for z<1.57 in the standard normal distribution table.

This represents the area under curve shaded grey in below picture.
The area is 0.94179. (So, it's not a calculation, but a lookup).