SSAT Middle Level Math : How to find mean
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Example Questions
Example Question #101 : Data Analysis And Probability
In Maria's family, her parents are both 45 years old, and her younger brother is 2 years younger than she is. What is the mean of their ages, if Maria is 5 years old?
The mean of a set is found by finding the sum of the set and then dividing by the number of items in the set. Given that both of her parents are 45 years old, that Maria is 5 years old, and that her brother is 3 years old (being 2 years younger than she is), the mean is calculated using this equation:
Example Question #61 : Median
The substitute teacher gave her class a quiz. Initially, she believed that there were 15 students in her class who scored an average of 7 out of 10. However, she later realized that there was a 16th student in the class who simply refused to take the quiz, and thereby got a score of 0. What is the average quiz score (to the nearest hundredth), when considering this 16th student?
If 15 students got an average score of 7, and 1 student got a score of 0, the average score of the 16 students can be found with this equation:
Example Question #91 : How To Find Mean
A student wishes to receive an average score of 92 percent in his history class. His grade consists of five test scores, the first four of which he received the following grades: 86, 97, 95, and 89. On the last test he receives an 88. Is this score enough to have the desired average in the class (assuming no rounding)? If no, then what score did he need?
No, he needs a 93 to have an average score of 92.
Yes, this score will give him an average of 92.
No, he needs a 89 to have an average score of 92.
No, he needs a 92 to have an average score of 92.
No, he needs a 99 to have an average score of 92.
No, he needs a 93 to have an average score of 92.
The question asks to find the average score of the five tests taken and to compare it to the desired average of 92 percent. To find the average, add all five scores then divide by five.
His test score of 88 will give him a class average of 91, not 92. To determine what score he needs, take the final test score to be the variable x, and use the average equation again, this time using the desired average of 92. Solve for x.
Therefore, the score he must receive to average a 92, without rounding, is a 93.
Example Question #91 : Mean
What number is halfway between 
The two numbers are 
Example Question #91 : How To Find Mean
Find the mean of the following set of numbers:
Add the numbers, and divide by 5:
Example Question #92 : How To Find Mean
Find the mean of this set of numbers:
First add all the numbers; then, divide by the amount of numbers in the set:
Answer: The mean is 
Example Question #93 : How To Find Mean
Find the mean of the following set:
The mean is the sum of the numbers in the set divided by the number of values in the set:
Example Question #95 : Mean
Olivia is considering buying a new car. She is looking at three different cars. The price for the three cars is 
First add up the prices of each of the cars:
Then divide that number by the total number of cars:
Answer: The average price of a car Olivia is considering is
Example Question #94 : How To Find Mean
Find the mean of this set of numbers:
First, add the numbers in the set:
Then divide by the amount of numbers in the set:
Answer: The mean is 
Example Question #97 : Mean
Andy is grading the tests of 
To find the average, you must first add up all of the test scores. The total is 
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