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OpenStudy (anonymous):
the mean of 4 numbers is 20 if three of the numbers are 18.19, and 20 what is the 4th number
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OpenStudy (anonymous):
x+y+z+w/4=20 x=19 y=18 z=20 w=? 18+19+20+w=80 57+w=80 w=23 18+19+20+23/4=20 18+19+20+23=80 CHECK
OpenStudy (anonymous):
For their mean to be 20, their sum must be 80. As the sum of the first three is 67, the fourth must be 23.
OpenStudy (anonymous):
^57
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