Question

measures of spread (variation):
range & interquartile range (iqr)
measures of spread tell you how spread out your data is, or
how much it varies.
range: the difference between the maximum and
minimum values in a data set (simply subtract the
highest and lowest numbers!)
maximum value minimum value
example: 20, 13, 22, 17, 28, 10, 25 range → 28 − 10 = 18
you try: find the range for the following data.

1. 34, 15, 9, 33, 27, 12, 27, 25, 30
2. 8, 90, 5, 80, 27, 50
3. 5, 4, 3, 5, 4, 2, 2, 6
4. 35, 41, 68, 35, 83

Explanation:

Problem 1:

Step1: Find max and min

Data: 34,15,9,33,27,12,27,25,30
Max = 34, Min = 9

Step2: Calculate range

Range = Max - Min = 34 - 9 = 25

Step1: Find max and min

Data: 8,90,5,80,27,50
Max = 90, Min = 5

Step2: Calculate range

Range = 90 - 5 = 85

Step1: Find max and min

Data: 5,4,3,5,4,2,2,6
Max = 6, Min = 2

Step2: Calculate range

Range = 6 - 2 = 4

Answer:

25

Problem 2: