seven numbers have a mean of 8. six of the numbers are 9,7,6,4,11 and 10. find the seventh number.

Question

 finding the missing number in a sequence of numbers that have a mean of a certain number. 

Answer 1

mean  (average) = 8 = (9+7+6+4+11+10+x) / 7

 

multiply by 7 to get  56 = 47 + x.  You finish!; check the work.