Practice Problems: Supplement 10 (S10), Work Measurement

Problem 1:

Carolyn Barrett, a marketing surveyor, takes an average of 10 minutes to complete a particular questionnaire. Carolyn’s performance rating (pace) is 110% and there is an allowance of 15%.

What is the Normal time for completing this questionnaire?

What is the Standard time for completing this questionnaire?

Problem 2:

Tom Leonard, of Leonard, Spitz, and Wareham, takes 3 hours and 25 minutes to write an end of month report. Tom is rated at 95% (work pace is 95%) and the office has a personal time allowance of 8%. There is no delay time or fatigue time.

What is the Normal time for writing an end of month report?

What is the Standard time for writing an end of month report?

Problem 3:

The two steps in preparing chocolate candy bars are molding and packaging. Personal fatigue and delay allowances are set at 15%. The molding machine operator is rated at 110% and the packer is rated at 80%. Observed times per batch are given below.

Observed Time in Minutes
Task / 1 / 2 / 3 / 4
Molding / 26 / 30 / 29 / 31
Packing / 45 / 50 / 35 / 30

Determine the Normal and standard times for both tasks.

Problem 4:

A work-study sample of a manufacturing activity conducted over a 40-hour period shows that a worker with an 85% rating produced 12 parts. The worker’s idle time was 10% and the allowance factor was 12%

Find the Normal and Standard time for this activity.

Problem 5:

Jim and Bob recently time-studied a janitorial task. From a sample of 75 observations, they computed an average cycle time of 15 minutes with a standard deviation of 2 minutes. Was their sample large enough that one can be 99% confident that the standard time is within 5% of the true value?

Problem 6:

Consider the following task broken down into 5 MTM elements:

TMUs / Code in MTM Books
Reach to tool box / 14.2 / R12D
Grasp a tool / 3.5 / BG1
Separate tool by pressing / 10.6 / AP2
Turn tool / 3.5 / T45S
Move and focus eyes / 13.4 / M12B

What is the total time for the task?

ANSWERS

Problem 1:

Problem 2:

Problem 3:

Observed Times in Minutes
Task / 1 / 2 / 3 / 4
Molding / 26 / 30 / 29 / 31
Packing / 45 / 50 / 35 / 30

For Molding:

For Packing:

Average actual Packing time = 40 minutes

Problem 4:

Average actual time = 40 hours

Problem 5:

To find the number of samples required:

Therefore, the sample size of 75 is sufficient.

Problem 6:

TMUs / Code in MTM Books
Reach to tool box / 14.2 / R12D
Grasp a tool / 3.5 / BG1
Separate tool by pressing / 10.6 / AP2
Turn tool / 3.5 / T45S
Move and focus eyes / 13.4 / M12B
TOTAL / 45.2

Remember: 1 TMU = .0006 minutes.

Translating to minutes: 45.2 TMUs * .0006 = .027 minutes

Translating to seconds: .027 minutes * 60 = 1.627 seconds

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