Review of Introductory Mathematics
AVERAGES
Average Value
The summation symbol, , introduced in the first chapter, is often used when dealing with the
average value,
.
x
Using the first example in this chapter, the average value could have been expressed in the
following manner:
xcar
N
x i
i 1
N
where:
=
the average value (cost) of a car
xcar
xi
=
each of the individual car prices
N
=
total number of cars
The right side of the above equation can then be rewritten.
xcar
x1
x2
x3
x4
x5
x6
6
substituting 10,200 for x1, 11300 for x2, 9,900 for x3, etc.
xcar
10,200
11,300
9,900
12,000
18,000
7600
6
= 11,500
xcar
Rev. 0
Page 21
MA-01
