Answer:
Step-by-step explanation:
Answer:
Measure of Data Dispersion
Step-by-step explanation:
Standard deviation is used to show the variation and dispersion in a group of data. It shows how separated the data's are to each other and how each data can be related to the other.
A normal data distribution are those group of data, that are distributed in a wide range. The standard deviation helps to to measure how they are been spread out.
Standard deviation does not measure the shape, quality, and center of data. This are measured with graphs, range, mean and median.
Answer:
c
Step-by-step explanation:
So, since averages are defined as:
So, since P are the total number of elements and P_k is the P_kth student. This is saying if we sum over each student's score and divide it by the number of students, we should get P, which is true.
So, using that logic, the other class can be represented as:
We can take both of these equations and multiply them by N:
So, if we want to find the average of this we should add both our equations then divide by P+N, which is the number of all the students.
To make this simpler we can replace our LHS with 86, since that's the average of both classes combined.
Simplified we would have P/N=3/8.
To start I would add 400 + 200, and that equals 600.
Then I would add 30 + 50, and that equals 80.
And then I have 2 left over.
600 + 80 = 680
Add the left over 2, so 680 + 2
680 + 2 = 682. Your answer is 682.
I hope this helps!
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