A Worker Was Observed for Four Cycles of a Repetitive

question 95

Multiple Choice

A worker was observed for four cycles of a repetitive task.The observer used the continuous method for recording the times.The continuous times (in seconds) for each element are:
$$\begin{array} {r } { \text { Cycles } } \quad \quad \quad \\\begin{array} { | l | c | c | c | c | } \hline \quad \text { Element } & 1 & 2 & 3 & 4 \\\text { 1. Pick up nut \& bolt } & 2 & 12 & 25 & 39 \\\text { 2. Thread nut onto bolt } & 5 & 16 & 29 & 42 \\\text { 3. Pick up wrench } &7 & 18 & 32 & 43 \\\text { 4. Tighten bolt, lay wrench } &11 & 23 & 38 & 48 \\\text { aside } & \\\hline\end{array}\end{array}$$
Which one of the following are the "select times" ( $\bar{t}$ ) for each element? The first number is the select time for the first element,the second number is the select time for the second element,and so on.

• A) 19.5, 23, 25, 30
• B) 1.5, 3.5, 5, 2
• C) 2, 3, 2, 5
• D) 1.5, 3.5, 2, 5

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