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Chapter 7: Statistical Analyses
7307ENG.DOC CH 7, Statistical Analyses, English Julie Hewlett Revised: 07/29/98 12:07 PM Printed: 05/19/99
9:00 AM Page 130 of 22
mean(, median(, and mode(mean(, median(, and mode(
-
v
"
"
3, 4, and 5 3, 4, and 5
median(
returns the median (the middle element) of list when
the elements, even if the list elements are not arranged in
numerical order. With an even number of elements, the
calculator returns the average of the two middle elements.
mean(
returns the mean (mathematical average) of list.
mode(
returns the mode (element which occurs most frequently) of
list.
If a second list, freq, is specified, it is interpreted as the
frequency of the elements in the first list. list and freq must
have the same number of elements. If freq is not included,
then the default is 1 and every element in the first list is only
counted once.
mean(
list[,freq]
)
median(
list[,freq]
)
mode(
list[,freq]
)
Calculate Davids final course average for his math class.
He received an 85 on Test 1, a 78 on Test 2, and a 90 on Test 3.
He received an 82 on his Midterm Exam and a 75 on his
Final Exam.
Tests count 1 time, the Midterm counts 2 times, and the Final
Exam counts 3 times.
1. Create two lists in the List
editor,
TEST
and
FREQ
.
3
For more information on entering lists,
see Chapter 5:Lists.
³
{85,78,90,82,75}
{1,1,1,2,3}
¨
TEST
¨
FREQ