If X Is a Normal Random Variable with Mean 5

question 63

Multiple Choice

If X is a normal random variable with mean 5, and if the probability that X is more than 4.08 is .5910 (as shown below) , then what is the standard deviation of X? (Note: the diagram is not necessarily to scale.)

• A)4.00
• B)2.67
• C)2.00
• D)1.00

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