Construction of the table below facilitates computation of the measures of central tendency and

dispersion. Note that the observations have been listed in ascending order.

(X-u) 2

X

(X - u)

6

-4

16

6

-4

16

7

-3

9

8

-2

4

9

-1

1

11

1

1

13

3

9

13

3

9

13

3

9

14

_4

16

ΣX = 100

Σ(X - u) = 0

Σ(X-u)2 = 90

1. B Mean: = ΣX = 100 = 10

(Frame 25)

2. A Median: 9 + 11 = 20 = 10. If you did not put the data in

2

2

an ordered array, you would have obtained the wrong answer.

(Frame 29)

3. D Mode: 13 (occurs 3 times)

(Frame 31)

4. D Range = largest - smallest - 14 - 6 = 8

(Frame 34)

5. C

Standard deviation σ =

(X-u)2

=

90

=

9

=

3

N

10

(Frame 36)

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