Well, a mean is the same thing as an average. So, the average of 5 and another number is 3â5. This unknown number will be represented by the variable x.
The formula is: (5+x)/2 = 3â5.
Step 1: Multiply both sides by 2. 5+x = 6â5.
Step 2: Subtract 5 from both sides. x = 6â5 - 5.
If you want to get a decimal answer, just find 6â5: 13.416, and then subtract 5 to get 8.416.
Answers & Comments
Verified answer
Geometric mean is √(xy)
3√5 = √(x5)
9*5 = x5
x = 9
check
√(xy) = √(5*9) = 3√5
edit: other answers are the arithmetic mean, not the geometric mean.
.
Well, a mean is the same thing as an average. So, the average of 5 and another number is 3â5. This unknown number will be represented by the variable x.
The formula is: (5+x)/2 = 3â5.
Step 1: Multiply both sides by 2. 5+x = 6â5.
Step 2: Subtract 5 from both sides. x = 6â5 - 5.
If you want to get a decimal answer, just find 6â5: 13.416, and then subtract 5 to get 8.416.
(5+x)/2=3â5
5+x=6â5
x=6â5 - 5
x=8.416407...