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{"ops":[{"insert":"Sacks of potatotes are packed by an automatic loader with mean weight 114 lb. in a test it \n\nwas found that 10% bags were over 116 lb. use this to find the SD of the process. If the \n\nmachine is now adjusted to a mean weight of 113 lb, what percent are now over 116lb, if \n\nSD remains unaltered?\n\n13) In a soap making process it was found that 6.23\n\n% of bars produced weighed less than 90.50 \n\ng and 4% weighed more than 100.25 g\n\na. Find the mean and the S.D. of the process.\n\nb. What percent of the bars would you expect to weigh less than 88g?\n\n14) A light bulb manufacturer finds that 5% of his bulbs last more than 500 hours. An \n\nimprovement in the process meant that the mean lifetime was increased by 50 hours. In a \n\nnew test, 20% of bulbs now lasted longer than 500 hours. Find the mean and standard \n\ndeviation of the original process.\n"}]}
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