X Is a Normally Distributed Random Variable with a Mean

question 39

Multiple Choice

X is a normally distributed random variable with a mean of 10.00. If the probability that X is less than 11.54 is 0.67 (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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Definitions:

Estimated Date of Confinement (EDC)

The expected due date for a pregnant woman to give birth.

Ultrasonography

A diagnostic imaging technique using ultrasound waves to visualize internal organs, tissues, or blood flow for medical examination.

Trimester

One of the three parts into which pregnancy is divided, each lasting about three months, used to monitor fetal development and maternal health.

Estimated Date of Confinement (EDC)

The predicted date of a pregnant woman's delivery.