Mean, Mode, Median, Range
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Range
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The range is the highest score minus the lowest score.
103 – 22 = 81
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Mean
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Find the mean (average)
180  229  330  274  276  245  266  301  218  191
10
2510
 251
10
How many days were less than 251
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5
Mean
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Microwave: 100 – 25 un-popped = 75 popped
Air-Popped: 100 – 35 un-popped = 65 popped
Stovetop: 100 – 2 un-popped = 98 popped
To find the mean (average), add the
number of popped and divide by 3
75  65  98
3

238
 79 . 333  79
3
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Jake’s test scores for the first term of chemistry class were 78, 68, 73, 94,
and 62. Which of the measures of central tendency would make Jake’s test
scores seem as high as possible?
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Write the numbers in order from smallest to largest
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Range (largest
Mean :
62 68 73 78 94
number
- smallest
number)
62  68  73  78  94
5

: 94 - 62  32
375
 75
5
Median: Middle number; cross out one from the top and
one from the bottom until you find the middle number
The mode is the number that occurs the most. In this
set of numbers, no number occurred more than once.
Mean
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So far in geography class, a student’s quiz scores are 93%, 91%, 83%, and
79%. What score does the student need on the fifth quiz to have a mean
quiz score of 88%? All the quizzes have equal weights.
A) 86.5%
A) 95%
A) 94%
D) 89%
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The mean is the sum of a set of numbers divided
by the number of numbers in the set
88 
93  91  83  79  x
5
Multiply each
side of the
equation by 5
440  93  91  83  79  x
Combine like terms
Subtract 346
from each side
of the equation
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440  346  x
94  x
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