statistic revision for exam

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Question description

(a) A metal stamping company produces metal parts with mean length of 20 cm and a known standard deviation of 0.5 cm. The customers will only accept parts with length within the range of 18.8cm to 21.4 cm. Parts outside the range are non-conforming, considered as either too long or too short. Parts which are too long are sent for rework, to shorten them. Parts which are too short are rejected as scrap. Find: (i) Reject percentage of the parts. (ii) Rework percentage of the parts. (iii) The yield (acceptable to customers) percentage of the parts.   (need help here plus what is it bionomial if its not then what is it) i need full working as well

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