Question 564751: For the following scores, what is Σ(X + 1)?
Scores: A.2, b.0, c.4, d.2
I dont understand what Σ represents? I do understand that you do it lastly .
So would you start out as... but then where do I go from here?
A. Σ(2 + 1)
B. Σ(0 + 1)
C. Σ(4 + 1)
D. Σ(2 + 1)
thanks soo much for your help!
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! Σ means "the sum of".
example:
the sum of (2 + 1) = 3
the sum of (0 + 1) = 1
the sum of (4 + 5) = 5
the sum of (2 + 1) = 3
usually that symbol is used to get the sum of a bunch of numbers in a list or table as shown below:
i value
1 2
2 0
3 4
4 2
i is the name of the subscript that identifies the position of each element in the list or table.
x is the name of the variable used for each element.
each value in the table is identified by the variable name followed by the subscript.
you would then identify each unique value in the table by the variable name followed by the subscript.
in this table, that would be shown as:
x[1] = 2
x[2] = 0
x[3] = 4
x[4] = 2
if you want to find the total value in the table, you would then be asked to provide the sum of x[i] for i = 1 to 4.
this would be shown as Σ (x[i]) for i = 1 to 4
when i = 1, x[i] = 2
when i = 2, x[i] = 0
when i = 3, x[i] = 4
when i = 4, x[i] = 2
the Σ (x[i]) for i = 1 to 4 would then be equal to 2 + 0 + 4 + 2 = 8.
judging by the way the question is posed, i suspect that all they want to know is the sum of (x + 1) when x is equal to the value shown.
your answer would, in that case, be:
A. Σ(2 + 1) = 3
B. Σ(0 + 1) = 1
C. Σ(4 + 1) = 5
D. Σ(2 + 1) = 3
|
|
|
