Question: 2. The continuous timing method is used to direct time study a manual task cycle consisting of four elements: a, b, c, and d. Two

2. The continuous timing method is used to direct

2. The continuous timing method is used to direct time study a manual task cycle consisting of four elements: a, b, c, and d. Two parts are produced each cycle. Element d is an irregular element performed once every six cycles. All elements were performance rated at 90%. The PFD allowance is 11 %. Determine (a) the normalized time for the cycle, (b) the standard time per part, (c) the worker's efficiency if the worker completes 844 parts in an 8-hour shift during which she works 7 hours and 10 min. element a b d Obser.time 35 .60 .86 1.46 Normal Time Tn = T obs. (PR) Standard time T std. = Tn (1+ A pfd) Standard Time (work - machine) T std = T nw ( 1 +A pfd) + Tm (1 + Am) Confidence interval Pr (Te lies within x prom. z a/2 o/ raiz cuadrada n) = (1-a) Standard deviation S = (raiz cuadrada) (x - x prom.)^2 / n-1 Confidence interval size Pr (Te lies within x prom. Ita/2 s/ raiz cuadrada n) = (1-x) Interval size x prom. = kx. prom. Cycles n n= (t a/2 s/kx prom.) ^2 =

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