A Manufacturer of Personal Computers Tests Competing Brands and Finds

question 75

Multiple Choice

A manufacturer of personal computers tests competing brands and finds that the amount of energy they require is normally distributed with a mean of 285 kwh and a standard deviation of 9.1 kwh. If the lowest 25 percent and the highest 30 percent are not included in a second round of tests, what are the upper and lower limits for the energy amounts of the remaining computers?

• A) [269.76, 300.24]
• B) [278.86, 289.78]
• C) [280.22, 289.78]
• D) [280.22, 300.24]

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Definitions:

Swaying

Moving or causing to move slowly or rhythmically backward and forward or from side to side.

Oral Communication

The process of expressing information or ideas by word of mouth.

Personal Pronouns

Words used to substitute for specific names of people or things, such as 'he,' 'she,' 'they,' and 'it.'

Written Communication

The exchange of messages or information through written symbols, texts, or documents.