cooper needs to repair a malfunctioning conveyor. he considers each step and the effort each one would…

cooper needs to repair a malfunctioning conveyor. he considers each step and the effort each one would take:\n*determine the problem, 1.5 - 2 hours\n*find replacement parts, 15 - 30 minutes\n*replace the broken parts, 4 - 5 hours\nwhich is the best estimate of the total effort it will take cooper to fix the conveyor?\na) about 1/2 day\nb) about 7 hours\nc) about 1 day\nd) about 450 minutes

cooper needs to repair a malfunctioning conveyor. he considers each step and the effort each one would take:\n*determine the problem, 1.5 - 2 hours\n*find replacement parts, 15 - 30 minutes\n*replace the broken parts, 4 - 5 hours\nwhich is the best estimate of the total effort it will take cooper to fix the conveyor?\na) about 1/2 day\nb) about 7 hours\nc) about 1 day\nd) about 450 minutes

Answer

Explanation:

Step1: Convert time - ranges to single values for estimation

We take the mid - point of each time range. For determining the problem, $\frac{1.5 + 2}{2}=1.75$ hours. For finding replacement parts, $\frac{15+30}{2}=22.5$ minutes which is $\frac{22.5}{60}=0.375$ hours. For replacing broken parts, $\frac{4 + 5}{2}=4.5$ hours.

Step2: Calculate total time

Total time $T=1.75+0.375 + 4.5=6.625$ hours.

Answer:

B. about 7 hours