The arithmetic mean of 10 consecutive even integers is 3. What is the least of these 10 even integers?
The arithmetic mean of 10 consecutive even integers is 3. What is the least of these 10 even integers? If the mean is 3, then five of the numbers must be less than 3 and five greater than 3. The numbers less than 3 must be −6, −4, −2, 0, 2 and those greater than 3 must be 4, 6, 8, 10, and 12. The least of these is −6 .
-tommarvoloriddle
THX, tommarvoloriddle !!!
Here's one other way
Let 2n be the smallest integer and 2n + 18 the largest
The sum of these divided by 2 will = the mean
So
[ 2n + 2n + 18 ]
____________ = 3 multiply both sides by 2
2
2n + 2n +18 = 6
4n + 18 = 6 subtract 18 from both sides
4n = -12 divide both sides by 4
n = - 3
So...the smallest integer = 2n = 2(-3) = - 6