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Reply To: Normal Distribution2018-11-26T15:23:32+10:00

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A wood saw cuts timber to an average length of 1200mm, with a standard deviation of 6mm. What are the limits of timber that would “very probably” lie between?

“very probably” means within 2 standard deviations

find the lower limit which means set 2 standard deviations below the mean 

1200 – 2 × 6 = 1188

ind the upper limit which means set 2 standard deviations above the mean 

1200 + 2 × 6 = 1212

∴ 1188mm – 1212mm

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