Basic Statistics
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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?
98
90
71
82
95
Explanation
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.
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?
98
90
71
82
95
Explanation
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.
If the average of 
Explanation
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 
If the average of
Explanation
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
What is the range of the following data set?
Explanation
What is the range of the following data set?
The range is found by taking the difference between the largest and smallest value in the data set.
Largest: 103
Smallest: 1
So our range is
What is the range of the following data set?
Explanation
What is the range of the following data set?
The range is found by taking the difference between the largest and smallest value in the data set.
Largest: 103
Smallest: 1
So our range is
Determine the mode of the set.
Explanation
Mode refers to the number occuring most often, so in this example we are looking for the numbers that repeat and how many times they repeat.
Now because all three numbers repeated an equal amount of time, all three then become our mode.
Answer :
Determine the mode of the set.
Explanation
Mode refers to the number occuring most often, so in this example we are looking for the numbers that repeat and how many times they repeat.
Now because all three numbers repeated an equal amount of time, all three then become our mode.
Answer :
What is the mean of the following numbers?
88,99,31,47,68,27
Explanation
To find the mean you add all of the numbers together and divide it by the amount of numbers. In this case there are six numbers so
The answer is 
What is the mean of the following numbers?
88,99,31,47,68,27
Explanation
To find the mean you add all of the numbers together and divide it by the amount of numbers. In this case there are six numbers so
The answer is