Suppose X is a normal random variable with mean = 100 and standard deviation = 20....

Question

Question

Suppose X is a normal random variable with mean = 100 and standard deviation = 20. What is the Z-value for X= 90?

math Statistics-And-Probability

Answer 1

Answer #1

solution

using z-score formula

z =X -/

z=90-100/20

z=-0.5

Answer 2

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