Khamis, 7 Julai 2016
Measures of Central
Tendency
The term "measures
of central tendency" refers to finding the mean, median and mode.
Mean- Average
Median- Middle Value,
when the data is arranged in numerical order,
Mode- The value (number)
that appears the most.
Example 1:
Find the mean, median
and mode for the following data:
5, 15, 10, 15, 5, 10,
10, 20, 25, 15.
(You will need to
organize the data.)
5, 5, 10, 10, 10, 15,
15, 15, 20, 25
Example 2 :
On his first 5 biology
tests, Bob received the following scores:
72, 86, 92, 63, and 77. What test
score must Bob earn on his sixth test so that his average (mean score) for all
six tests will be 80? Show how you
arrived at your answer.
Possible solution:
Set up an equation to represent the
situation. Remember to use all 6 test
scores:
72 + 86 + 92 + 63 +
77 + x / 6 = 80
Cross multiply and solve: (80)(6) = 390 + x
480 = 390 + x
- 390 -390 / 90 = x
Bob must get a 90 on
the sixth test.
Hai, i want to ask, The weekly salaries of size employees at McDonald are $140,$220,$90,$180,$140,$200. For these six salaries, find: (a) the mean, (b) the median and (c) the mode
BalasPadamHey :D
PadamList the data in order: 90, 140, 140, 180, 200, 220
Mean:(sum of all / 6) 90+ 140+ 140+ 180 + 200 + 220/6 = 161.66
Median: 90,140,140,180,200,220
The two numbers that fall in the middle need to be
averaged. 140 + 180 / 2 = 160
Mode: The number that appears the most is 140
Hello Can you please solve this, Andy has grades of 84, 65, and 76 on three math tests. What grade must he obtain on the next test to have an average of exactly 80 for the four tests?
BalasPadamhello Sir The answer at the comment below Thank you.
Padam84 + 65 + 76+ x = 80(average) cross multiply
BalasPadam(4)(80) = 225 + x
320 = 225 + x
-225 -225
95 = x
Andy needs a 95 on his next test.