Wilson Hammond
09/13/2023 · Primary School

A construction company employs three sales engineers. Engineers 1,2 , and 3 estimate the costs of \( 15 \%, 25 \% \), and \( 60 \% \), respectively, of all jobs bid on by the company. For \( i=1,2,3 \), define \( E_{i} \) to be the event that a job is estimated by engineer \( i \). The following probabilities describe the rates at which the engineers make serious errors in estimating costs: \( P\left(\right. \) error \( \left.\mid E_{1}\right)=0.04, P\left(e r r o r \mid E_{2}\right)=0.03 \), and \( P\left(\right. \) error \( \left.\mid E_{3}\right)=0.02 \). Complete parts a through \( d \). a. If a particular bid results in a serious error in estimating job cost, what is the probability that the error was made by engineer 1 ? \( P\left(E_{1} \mid\right. \) error) \( =\square \) (Round to the nearest thousandth as needed.) b. If a particular bid results in a serious error in estimating job cost, what is the probability that the error was made by engineer 2 ?

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a. The probability that the error was made by engineer 1 is approximately 0.235. b. The probability that the error was made by engineer 2 is approximately 0.294.

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