In Statistics, when you are is using the standard normal distribution, P(z < 0) = 0.5.
What is a normal distribution?
A normal distribution is also referred to as the Gaussian distribution and it can be defined as a probability distribution that is continuous and symmetrical on both sides of the mean, which shows that all data near the mean have a higher frequency than data that are far from the mean.
This ultimately implies that, when you are is using the standard normal distribution, P(z < 0) must be equal to 0.5 because it has a median of zero (0).
Read more on normal distribution here: https://brainly.com/question/4637344
