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The Time to Complete the Construction of a Soapbox Derby

Question 135

Multiple Choice

The time to complete the construction of a soapbox derby car is normally distributed with a mean of three hours and a standard deviation of one hour. Find the probability that it would take between 2.5 and 3.5 hours to construct a soapbox derby car.


A) 0.3085
B) 0.3830
C) 0.6170
D) 0.6915

Correct Answer:

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