Algebra 1 : Algebra 1
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Example Questions
Example Question #11 : How To Find Mean
A math test was given to a classroom of students last week. 8 students received a score of 90, 6 students received a score of 80, and 6 students received a score of 70. What was the average score of the class?
To find the average score, you must total the scores of everyone in the class and divide it by the number of students in the class. 8 students received a score of 90, 6 students received a score of 80, and 6 students received a score of 70. The total score of the class is 
Example Question #11 : How To Find Mean
This semester, Reese took 4 tests for his algebra class. Among the 4 tests, he earned an average score of 88. If he scored an 84, 85, and 90 on his first 3 tests, what was his score on the fourth test?
Reese's average score is calculated by dividing the sum of his test scores by the number of tests he took. This semester, Reese took 4 tests and his average score was 88, which means the sum of his test scores must be 362 (88 multiplied by 4). On the first three tests, he scored an 84, 85, and 90. This means that his fourth test score must be
Example Question #13 : How To Find Mean
In terms of 
Add, then divide by 5:
Example Question #13 : How To Find Mean
What is the mean of all of the prime numbers between 75 and 100?
The prime numbers between 75 and 100 are 79, 83, 89, and 97. To find their mean, add them and divide by 4:
Example Question #15 : Statistics And Probability
What is the mean of all of the natural numbers from 1 to 99?
The sum of the first 
The mean of the first 99 natural numbers is 
Example Question #1441 : Algebra 1
A student is interested in knowing how much time his classmates spend watching TV each night. He asks them and gets the following results (in minutes).
30, 60, 45, 42, 48, 87, 15, 22, 25, 92, 70, 75
What was the mean time spent watching TV?
30, 60, 45, 42, 48, 87, 15, 22, 25, 92, 70, 75
First, sum the number of minutes spent watching TV by all classmates.
Then, divide the sum by the number of students. There are twelve values, so twelve students answered the question.
Example Question #22 : How To Find Mean
A short quiz with 5 questions is given to a class of 30 students. 7 students answered 5 questions correctly, 12 students answered 4 questions correctly, 9 students answered 3 questions correctly, and 2 students answered 2 questions correctly.
What is the mean number of correct answers among the students in the class?
To find the average score of the class, you must add the total score of all of the students and divide it by the number of students. 7 students answered 5 questions correctly, 12 students answered 4 questions correctly, 9 students answered 3 questions correctly, and 2 students answered 2 questions correctly, so this gives you a total score of 114: 
Example Question #1442 : Algebra 1
Find the mean of the following set of numbers: 32, 23, 46, 52, 37.
To find the mean, or average, of a set of numbers, you first add all of the numbers together:
Then, you divide the sum by the total number of numbers, which in this set is 5 (i.e., there are 5 numbers in this set):
38 is the mean, or average, of this set of numbers.
Example Question #1443 : Algebra 1
Find the mean of the following: 65, 70, 91, 85, 89
Example Question #1444 : Algebra 1
We want to create a three-digit code for a combination lock. Only digits from 0-9 are allowed and digits cannot be repeated. How many such codes can be generated?
The first position can be filled in 10 ways. Since repetition is not allowed, the second position can be filled in 9 ways, and finally the third position can be filled in 8 ways giving us the correct answer of
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