SOLUTION: If the average of marks of four student be 62, mark of one student is 1 less then the average,mark of second student is 7 more then average,mark of third student is 1 less then th

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 Click here to see ALL problems on Average Question 750173: If the average of marks of four student be 62, mark of one student is 1 less then the average,mark of second student is 7 more then average,mark of third student is 1 less then the average then find the mark of fourth student.Answer by JoeTaxpayer(186)   (Show Source): You can put this solution on YOUR website!You have -1,+7,-1 and need to find a 4th number that zeroes out the differences. 7-1-1 = 5 and x-1, x+7, x-1, x-5 will average to x You can substitute 62 for x to confirm, but this approach works regardless of the base number. We can answer without even knowing that average.