Mean micro of 250 screws and a standard deviation of 830

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Mean (µ ) of 250 screws and a standard deviation (? ) of 8.30.

Find the probability that production will go below 238 screws.

Find the probability that the production will go beyond 270 screws.

What proportion of the production will fall between 230 and 265 screws?

If 80% of the time our construction is X screws or less." What is the figure we use for X?

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In a sample of 55 mice a biologist found that 42 were able : in a sample of 55 mice a biologist found that 42 were able to run a maze in 30 seconds or less. find the 90 limit for

Mean micro of 250 screws and a standard deviation of 830 : mean micro of 250 screws and a standard deviation ? of 8.30.find the probability that production will go below 238

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