Measures of Central Tendency - Ungrouped Data

What is the mean of the following numbers ?

10, 39, 71, 39, 76, 38, 25

• 42.56

• 43.57

• 42.56

• 42.57

What number would you divide by to calculate the mean of 3, 4, 5, and 6?

• 5

• 4

• 4.5

• 9

What measure of central tendency is calculated by adding all the values and dividing the

sum by the number of values?

• mode

• median

• mean

• center

Determine the mean of the following set of numbers:

40, 61, 95, 79, 9, 50, 80, 63, 109, 42

• 62.79

• 61.78

• 62.80

• 61.80

What is the median of the following numbers?

10, 25, 38, 38, 39, 42, 71, 76

• 38.50

• 39

• 38

• 39.50

The front row in a movie theatre has 23 seats. If you were asked to sit in the seat that

occupied the median position, in which seat would you have to sit?

• 11

• 11.50

• 12

• 13

What is the term used to describe the distribution of a data set with one mode?

• UNIMODAL

• BIMODAL

• TRIMODAL

• MULTIMODAL

A student recorded her scores on weekly math quizzes that were marked out of a

possible 10 points. Her scores were as follows:

8, 5, 8, 5, 7, 6, 7, 7, 5, 7, 5, 5, 6, 6, 9, 8, 9, 7, 9, 9, 6, 8, 6, 6, 7

What is the mode of her scores on the weekly math quizzes?

• 6 - UNIMODAL

• 5,6,7,8 AND 9 - MULTIMODAL

• 6 AND 7 BIMODAL

• 5, 7 AND 9 TRIMODAL

What is the mode of the following numbers, and what word can be used to describe the

distribution of the data set?

3, 5, 4, 10, 3, 3, 4, 7, 4, 6, 5, 11, 9, 5, 7

• 3, 4, 5 TRIMODAL

• 3 AND 4 BIMODAL

• 3, 4,5 AND 7 TRIMODAL

• NO MODE

“What is the median score achieved by a student who recorded the following scores on

9 math quizzes?

68, 55, 70, 62, 71, 58, 81, 82, 63

• 70

• 71

• 63

• 68