A time study was conducted on a job that contains four elements. The observed times and performance ratings for six cycles are shown in the following table.

OBSERVATIONS $($minutes per cycle$)$

Element Performance

Rating $123456$

$185\%0\mathrm{.}440\mathrm{.}490\mathrm{.}390\mathrm{.}390\mathrm{.}390\mathrm{.}39$

$2801\mathrm{.}441\mathrm{.}441\mathrm{.}391\mathrm{.}391\mathrm{.}391\mathrm{.}44$

$31150\mathrm{.}790\mathrm{.}790\mathrm{.}690\mathrm{.}740\mathrm{.}790\mathrm{.}74$

$41001\mathrm{.}041\mathrm{.}091\mathrm{.}041\mathrm{.}091\mathrm{.}091\mathrm{.}14$

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