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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asked Aug 3, 2019 123k views

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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

Mathematics
middle-school

Aksadv asked

by Aksadv

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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

Voislav Sauca answered Aug 10, 2019

by Voislav Sauca

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