Please find the range, sample standard deviation and inter-quartile range (IQR) of the following data set.

21

25

31

42

48

61

61

73

83

95

range = 74

(Please enter an exact answer.)

standard deviation (ss) =

(Please show your answer to one decimal place.)

IQR =42

(Please enter an exact answer.) range = 195

(Please enter an exact answer.)

standard deviation =

(Please show your answer to one decimal place.)

IQR = 52

(Please enter an exact answer.)

A new number, 216, is added to the data set above. Please find the new range, sample standard deviation and IQR of the new data set.

Which measure of spread is less affected by the addition of the extreme observation?

• IQR X
• Range
• standard deviation

Correct