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31-05-2018
Mathematics

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the Times of sarah's first swim lengths are 27 seconds ,35 seconds ,and 31 seconds. in how many seconds must length four be completed so the mean is 30 seconds

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31-05-2018

Length four must be 27 seconds.
Mean=x1,x2,x3,x4/n
30=27+35+31+x4/4
30*4=93+x4
X4=120-93=27

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