To determine: The standard time for the operation
Introduction: Time study is the basis that helps set the standard time; it would time a sample of the performance of the worker.
Answer to Problem 22P
Thestandard time is calculated as 10.12 minutes.
Explanation of Solution
Given information:
The allowance factor is given as 10%. The observed time and performance rating for each element is given as follows:
| Element | Performance rating | Observation (minutes per cycle) | ||||
| 1 | 2 | 3 | 4 | 5 | ||
| Check mini-bar | 100 | 1.5 | 1.6 | 1.4 | 1.5 | 1.5 |
| Make one bed | 90 | 2.3 | 2.5 | 2.1 | 2.2 | 2.4 |
| Vacuum floor | 120 | 1.7 | 1.9 | 1.9 | 1.4 | 1.6 |
| Clean bath | 100 | 3.5 | 3.6 | 3.6 | 3.6 | 3.2 |
Formulae to calculate the standard time:
Calculate the standard time:
| Element | Performance rating | Observation (minutes per cycle) | Average time | Normal time | ||||
| 1 | 2 | 3 | 4 | 5 | ||||
| Check mini-bar | 100% | 1.5 | 1.6 | 1.4 | 1.5 | 1.5 | 1.5 | 1.5 |
| Make one bed | 90% | 2.3 | 2.5 | 2.1 | 2.2 | 2.4 | 2.3 | 2.07 |
| Vacuum floor | 120% | 1.7 | 1.9 | 1.9 | 1.4 | 1.6 | 1.7 | 2.04 |
| Clean bath | 100% | 3.5 | 3.6 | 3.6 | 3.6 | 3.2 | 3.5 | 3.5 |
| Total | 9.11 | |||||||
Excel worksheet:
Calculate the average time to check mini-bar:
The average time is calculated by taking an average of the observation given, which is a summation of 1.5, 1.6, 1.4, 1.5, and 1.5 and dividing the result by 5. Hence, the average is 1.5 minutes.
Calculate the average time to make one bed:
The average time is calculated by taking an average of the observation given, which is summation of 2.3, 2.5, 2.1, 2.2, and 2.4 and dividing the result by 5. Hence, the average is 2.3 minutes.
Calculate the average time to vacuum floor:
The average time is calculated by taking an average of the observation given, which is summation of 1.7, 1.9, 1.9, 1.4, and 1.6 and dividing the result by 5. Hence, the average is 1.7 minutes.
Calculate the average time to clean bath:
The normal average time is calculated by taking an average of the observation given, which is summation of 3.5, 3.6, 3.6, 3.6, and 3.2 and dividing the result by 5. Hence, the average is 3.5 minutes.
Calculate the normal time to check mini-bar:
The normal time is calculated by multiplying average time and performance rating. The average time is given as 1.5 minutes, and performance rating is given as 100%. Hence, the normal time is 1.5 minutes.
Calculate the normal time to make one bed:
The normal time is calculated by multiplying average time and performance rating. The average time is given as 2.3 minutes, and performance rating is given as 90%. Hence, the normal time is 2.07 minutes.
Calculate the normal time to vacuum floor:
The normal time is calculated by multiplying average time and performance rating. The average time is given as 1.7 minutes, and performance rating is given as 120%. Hence, the normal time is 2.04 minutes.
Calculate the normal time to clean bath:
The normal time is calculated by multiplying average time and performance rating. The average time is given as 3.5 minutes, and performance rating is given as 100%. Hence, the normal time is 3.5 minutes.
Calculate the total normal time:
The normal time is calculate by adding the normal time to check the mini-bar, make one bed, vacuum floor, and clean bath.
Hence, the total normal time is 9.11 minutes.
Calculate the standard time:
The standard time is calculated by dividing the normal time with the value attained by subtracting the allowance factor from 1. Normal time is calculated as 9.11 minutes and the allowance factor is calculated as 0.10 or 10%.
Hence, the standard time is 10.12 minutes.
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Chapter 10 Solutions
Principles Of Operations Management
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