Given that Z is a standard normal random variable,the area to the left of a value z is expressed as
A) P(Z $\ge$ z)
B) P(Z $\le$ z)
C) P(0 $\le$ Z $\le$ z)
D) P(Z $\ge$ -z)

Question

Quizplus · Accepted Answer

The area to the left of a value z corresponds to the cumulative probability up to that value. Since a standard normal distribution is symmetric around zero, we can express this area as the probability that Z is less than or equal to z. Thus, the correct choice is B, which expresses this probability as P(Z ≤ z).

Given That Z Is a Standard Normal Random Variable,the Area ≥\ge≥

Given That Z Is a Standard Normal Random Variable,the Area $\ge$