Measures of Central Tendency and Spread Calculate

Which of the following is the average found by adding up the values of all data points and dividing them by the total number of data points?

• mean

• median

• mode

• range

Find the median of the following set of data points:

18, 21, 26, 30, 63, 49, 37, 68

(a)  

Find the mean of the following set of data points:

65, 80, 39, 55, 82, 32, 33, 87, 38, 79

(a)  

Find the mode of the following set of data points:

32, 22, 64, 40, 39, 29, 13, 83, 18, 40

(a)  

Find the range of the following set of data points:

42, 68, 40, 49, 99, 47, 94, 29, 90

(a)  

A teacher is analyzing the test scores of her 3 top students. She is trying to determine who has the MOST CONSISTENT test scores. What would be the best measure to determine who is the most consistent?

• mean

• median

• mode

• standard deviation

The teacher from question 6 has analyzed her top 3 students test scores, and found that they all have the exact same mean and range. She knows that she needs to find the standard deviation to determine who is the most consistent. Their standard deviations are:

STUDENT A: 4.5

STUDENT B: 9.7

STUDENT C: 1.3

Which student is the most consistent in their test scores?

• STUDENT A

• STUDENT B

• STUDENT C

• none of the above