Algebra 1 : Statistics and Probability
Study concepts, example questions & explanations for Algebra 1
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Example Questions
Example Question #41 : Statistics And Probability
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
82
98
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 #42 : Statistics And Probability
The mean of the following set is 8. What is 
Cannot be determined
9
8
1
2
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 #43 : Statistics And Probability
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 #1463 : 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 
Example Question #17 : Mean
If the average of 
If the average of 
We also know the average of 
The expression in the numerator represents the sum. By cross-multiplying, we get
Example Question #12 : Basic Statistics
If the average of 
To find the average of all the numbers, we need to find the sums from each average. Since the average of 
The average of 
Then, the total sum is 
So to find average, we do 
Example Question #44 : Statistics And Probability
If the average of 
We know the average of the 
When we cross-multiply, we get 
We know one of the value which is 
So 
Then 
Example Question #45 : Statistics And Probability
If the average of 
We know the average of the 
When we cross-multiply, we get 
We know one of the value which is 
So 
Then 
Example Question #46 : Statistics And Probability
If the average of 
If the average of 
We know the sum of two numbers is 
So then we can write 
Then 
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