The Expected (Mean)life of a Particular Type of Light Bulb

question 10

Multiple Choice

The expected (mean) life of a particular type of light bulb is 1,000 hours with a standard deviation of 50 hours. The life of this bulb is normally distributed. What is the probability that a randomly selected bulb would last longer than 1150 hours?

• A) 0.4987
• B) 0.9987
• C) 0.0013
• D) 0.5013
• E) 0.5513

---

Definitions:

Memory Retrieval

The process of recalling or bringing back information from the memory system into conscious awareness.

Sensory Storage

A very short-term storage system for sensory information before it is processed further for encoding or discarding.

Visual Features

Attributes or aspects of a visual stimulus, such as shape, color, size, and texture, that can be perceived and recognized.

Sensory Storage

The brief retention of sensory information, serving as a holding area for initial processing of sensory inputs.