[GMAT math practice question]
If the average (arithmetic mean) of 5 numbers is 30, what is the standard deviation of the numbers?
1) The smallest number of them is 30
2) The greatest number of them is 30
=>
Forget conventional ways of solving math questions. In DS, VA (Variable Approach) method is the easiest and quickest way to find the answer without actually solving the problem. Remember that equal number of variables and independent equations ensures a solution.
The first step of VA(Variable
...
If the average (arithmetic mean) of 5 numbers is 30, what is the standard deviation of the numbers?
1) The smallest number of them is 30
2) The greatest number of them is 30
=>
Forget conventional ways of solving math questions. In DS, VA (Variable Approach) method is the easiest and quickest way to find the answer without actually solving the problem. Remember that equal number of variables and independent equations ensures a solution.
The first step of VA(Variable
...
.jpg)
