Operating at temperature outside acceptable range

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Reference no: EM132178106

Rachel loves to bake cookies, but she has an old oven that has trouble maintaining a constant temperature. Assume the acceptable temperature range for making the cookies is 350 plus or minus 9 degrees. Six Sigma quality (3.4 defects per million units produced) is probably a bit much to ask of Rachel’s old oven.

a. What would the standard deviation in the temperature of her oven need to be if she settled for a “Three Sigma” level of quality? (Round your answer to 2 decimal places.)

Standard deviation degrees

b. If her oven exactly meets this quality level, what percentage of the time would her oven be operating at a temperature outside the acceptable range? Use Table 6-5. (Round your answer to 2 decimal places.)

Percentage of the time %

Reference no: EM132178106

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