Algebra 1 : Algebra 1
Study concepts, example questions & explanations for Algebra 1
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Example Questions
Example Question #34 : Statistics And Probability
This semester, Ned earned scores of 78, 84, 90, and 92 on his algebra exams. What is Ned's average score?
To find Ned's average score, you must take the sum of his test scores and divide it by the number of tests. The sum of Ned's scores is 344 and he took 4 tests. Therefore, his average test score must be 86
Example Question #35 : Statistics And Probability
Find the mean of the following set:
To find the mean (average) of a set, add up all the numbers, which is 217. Then, divide by the number of terms you have (7). This results in 31.
Example Question #12 : Mean
Consider the following numbers:
42, 51, 62, 47, 38, 50, 54, 44
The value 48.5 represents:
Neither the median nor the mean
The median
Both the mean and the median
The mean
Both the mean and the median
First, calculate the mean. Sum the values and divide by the total number of values:
Next, determine the median. Reorder the values in ascending order:
38, 42, 44, 47, 50, 51, 54, 62
The median is the middle number. In this case, there is no "middle" number because we have an even number of values. Therefore, both 47 and 50 are the "middle". Average these numbers:
Therefore, 48.5 represents both the mean and median.
Example Question #13 : Mean
Find the mean of the following numbers:
150, 88, 141, 110, 79
71
141
113.6
88
110
113.6
The mean is the average. The mean can be found by taking the sum of all the numbers (150 + 88 + 141 + 110 + 79 = 568) and then dividing the sum by how many numbers there are (5).
Our answer is 113 3/5, which can be written as a decimal.
Therefore 113 3/5 is equivalent to 113.6, which is our answer.
Example Question #131 : Basic Statistics
If you roll a fair die six million times, what is the average expected number that you roll?
3
4.5
3.5
2.5
4
3.5
The outcomes from rolling a die are {1,2,3,4,5,6}.
The mean is (1+2+3+4+5+6)/6 = 3.5.
Rolling the die six million times simply suggests that each number will appear approximately one million times. Since each number is rolled with equal probability, it doesn't matter how many times you perform the experiment; the answer will always remain the same.
Example Question #11 : Mean
Reginald has scores of {87, 79, 95, 91} on the first four exams in his Spanish class. What is the minimum score he must get on the fifth exam to get an A (90 or higher) for his final grade?
71
95
90
98
82
98
To find the fifth score, we need to set the average of all of the scores equal to 90.
Multiply both sides of the equation by 5.
Subtract 352 from both sides of equation.
Example Question #12 : Mean
The mean of the following set is 8. What is 
2
9
1
Cannot be determined
8
1
Let 
We know the mean is 8, and there are five values in the set, including the unknown 
Simplify.
Plug back into equation at top.
Example Question #1461 : Algebra 1
Given the set of numbers, find the mean.
The mean is the average of the set of numbers. Add all the numbers in the set and divide by the total numbers in the set.
There are 6 numbers in the set.
Example Question #1462 : Algebra 1
What is the mean?
To find mean, we add the sum of the numbers and divide it by the total numbers in the set.
The sum is
There are five numbers.
So 
Example Question #44 : Statistics And Probability
Find the mean.
To find mean, we add the total numbers up which is just 
There are five numbers.
So 
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