# Help With Cycle Time Problem

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Viewing 5 posts - 1 through 5 (of 5 total)
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• #54141

Roger
Guest

10 ct, 8 ct, 0 ct,7 ct,11 ct,3 ct,3 ct,3 ct,5 ct,10 ct…..what is the cycle time (ct) 80% of time? how did u get it? I used this equation below and i was told it was wrong….. do i need to sort the days?

days ppl percent
10 1 10
8 2 20
0 3 30
7 4 40
11 5 50
3 6 60
3 7 70
3 8 80
5 9 90
10 10 100

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#193888

Prabhu V
Participant

Hi,

Can you pls elaborate your query with what is the main objective and others…..

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#193901

Eric Maass
Participant

Hi Roger,

It sounds like you were given a set of individual cycle time measurements…and they want you to estimate the cycle time 80% of the time…Which is a rather vague request.
If they wanted you to tell them a value that 80% of the cycle time values are less than, then you would want to sort the data, and find the value that 80% are less than.
If they wanted you to assume that cycle times follow a normal distribution, you would use this sample of cycle times to come up with a sample mean and sample standard deviation, and use the normal distribution to estimate the value that 80% of the cycle times are less than.

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#193908

manipage
Guest

Hi Roger, I think the 80% of the time the cycle time will be 3, If it is correct, then you can find this applying simple pareto.

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#193910

Chris Seider
Participant

If you want the maximum cycle time you’d expect 80% of the time, you can add 0.84 times the standard deviation and add to the mean cycle time–if you are comfortable with assuming a normal distribution.

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