Allied & ICAR Exam Bank • ALLIED_0089 NAT • 2 Marks

Section 1: Engineering Mathematics

Probability and Statistics

Subtopic: Poisson, normal and binomial distributions

Question Statement:

For a standard normal distribution $Z \sim N(0, 1)$, the area under the probability density curve over $(-\infty, 0]$ is:

Answer Key:

0.5

Step-by-Step Solution & Explanation

By symmetry about zero, $P(Z \le 0) = 0.5$.
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