Answer to Question #341521 in Statistics and Probability for Himanshi

Question

Sacks of potatotes are packed by an automatic loader with mean weight 114 lb. in a test it

was found that 10% bags were over 116 lb. use this to find the SD of the process. If the

machine is now adjusted to a mean weight of 113 lb, what percent are now over 116lb, if

SD remains unaltered?

13) In a soap making process it was found that 6.23

% of bars produced weighed less than 90.50

g and 4% weighed more than 100.25 g

a. Find the mean and the S.D. of the process.

b. What percent of the bars would you expect to weigh less than 88g?

14) A light bulb manufacturer finds that 5% of his bulbs last more than 500 hours. An

improvement in the process meant that the mean lifetime was increased by 50 hours. In a

new test, 20% of bulbs now lasted longer than 500 hours. Find the mean and standard

deviation of the original process.

Answer 1

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