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The time that takes to complete a certain type of construction projects has a mean of...

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Statistics

The time that takes to complete a certain type of constructionprojects has a mean of 35.5 months and a standard deviation of 1.5months.

a. According to the Tchebysheff’s theorem, at least whatpercentage of these projects must have taken between 26.5 monthsand 44.5 months to complete?

b. If in addition we are told that the relative frequency curvefor the completion times is a bell-shaped curve, then approximatelywhat percentage of these projects would take more than 34 months tocompleted?

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The time that takes to complete a certain type of construction projects has a mean of 355 months and a standard deviation of 15 months ANSWER a According to the Tchebysheffs    See Answer
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