Tuesday
May 21, 2013

# Homework Help: Math

Posted by clolyne on Wednesday, August 24, 2011 at 9:11pm.

The mean of a set of n numbers is 180, if 54 is added to the set of numbers the new mean is 159. Find n

• Math - bobpursley, Wednesday, August 24, 2011 at 9:27pm

totalbefore=n*180
total after=(n+1)159

but total after is total before+54

total before=n*180
total before+54=(n+1)159

or n*180=(n+1)159 -54
solve for n
n*180-159n=159-54
n=105/21=you do it.

Related Questions

math - the arithmetic mean of a set of nine numbers is 5. when one more number ...
math - What is findind a five number summary of each ser of numbers 7,7,5,4,1,9,...
math - Tne union of the set of rational numbers and the set of irrational ...
AP Statistics (math) - Find a set of numbers that will satisfy the following ...
Math - 48,24,6,36,12,54 Which of the following describe this set. A. Numbers ...
7th grade Algebra - A set of whole numbers contains 1, 3, 4, 5, 6, 11, and X. ...
Math riddle - nine odd numbers have a sum of 243.find the sum of the first and ...
Math - How could I find the mean of each set of numbers which is 21,25,27,32,36,...
Math riddle - nine odd numbers have a sum of 243.find the sum of the first and ...
data management - For S = the set of whole numbers A = the set of numbers which ...