A group of doctors are planning on starting an outpatient surgery center but fir

Question

A group of doctors are planning on starting an outpatient surgery center but first they need to estimate how long each surgery is expected to take and obtain an estimate for the variability of this time. This time will affect the number of "rooms" they need in their new center. A surgery includes three parts: PREP, Actual Surgery, Recovery. They check with the local hospital hoping to obtain these estimates but were told that this data was not available, but data was available on each of the three parts above. They obtain this data shown below.

Explanation / Answer

Mean = (15+25+20) = 60

Variance = (12 +32 +42) = 1+9+16 = 26

Hence Standard deviation = SQRT(Variance) = SQRT(26) = 5.099

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