A Manufacturer of Personal Computers Tests Competing Brands and Finds $\left[ \begin{array} { l l } 269.76 & 300.24\end{array} \right]$

question 125

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) \(\left[ \begin{array} { l l }
• 269.76 & 300.24
• \end{array} \right]\)
• B) \(\left[ \begin{array} { l l }
• 269.76 & 289.78
• \end{array} \right]\)
• C) \([ 280.22\) \( \quad\)\( \quad\)\(289.78 ]\)
• D) \(\left[ \begin{array} { l l }
• 280.22 & 300.24
• \end{array} \right]\)

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