If Light Bulbs Have Lives That Are Normally Distributed with a Mean

question 32

Multiple Choice

If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, approximately what percentage of light bulbs has a life of more than 3000 hours?

• A) About 84%
• B) About 68%
• C) About 32%
• D) About 16%

---

Definitions:

Human Papillomavirus

A group of viruses that can cause warts or cancer in humans.

Prolactin

Anterior pituitary hormone that stimulates milk production by mammary glands.

Milk Production

The biological process in the mammary glands of female mammals to produce milk to feed their young.

Hormone

A chemical substance produced in the body that controls and regulates the activity of certain cells or organs.