All SAT Math Resources
Example Questions
Example Question #71 : Arithmetic Mean
If is the average (arithmetic mean) of and , is the average of and , and is the average of and , what is the average of , , and in terms of ?
First Step is to write each mean equation out.
Example Question #101 : Data Analysis
Based on the table, what is the the mean shoe size among the children?
To calculate the mean shoe size, first sum up all the shoe sizes and then divide by the number of children.
Looking at the table, there are five children.
Therefore the formula to calculate the mean becomes,
Example Question #72 : Arithmetic Mean
If Billy has an average of over 5 tests, what is the lowest score Billy can get over the next 3 tests in order to raise his average up to ?
In order to solve this lets write two general equations that we will solve.
From the first equation, we get.
Substitute tis into the next equation,
Solve for ,
Example Question #3023 : Sat Mathematics
The mean of a group of five numbers is 10. The numbers in the group are 7, 11, 23, 4, and x. What is x?
We know that the mean of the five numbers is ten. Therefore the sum of the five numbers, divided by 5, equals ten.
So,
After solving for x we learn that x equals 5.
The algebraic steps are as follows:
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