If X Is a Normal Random Variable with Mean 4

question 5

Multiple Choice

If X is a normal random variable with mean 4, and if the probability that X is less than 5.54 is .67 (as shown below) , then what is the standard deviation of X? (Note: the diagram is not necessarily to scale.)

• A)1.75
• B)3.50
• C)4.20
• D)12.25

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