The Mean Number of Text Messages Sent Per Month by Customers

question 23

Multiple Choice

The mean number of text messages sent per month by customers of a cell phone service provider is 1,850, and the standard deviation is 800. Find the z-score associated with 3,000 messages sent. ​

• A)z = 2.75
• B)z = 1.44
• C)z = -1.44
• D)z = 1.19
• E)z = 40.66

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Definitions:

Myometritis

An inflammation of the myometrium, the muscular layer of the uterus, often resulting from infection.

Endometritis

Inflammation of the inner lining of the uterus.

Vaginitis

Inflammation of the vagina that can result in discharge, itching, and pain, often caused by infection.

Cervicitis

Inflammation of the cervix, often due to infection, that can result in redness, swelling, and sometimes discharge.