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

21 23 24 25 29 47 54 72 72 76

range =(Please enter an exact answer.)standard deviation (s

s

) =(Please show your answer to one decimal place.)IQR =(Please enter an exact answer.)

A new number, 177, is added to the data set above. Please find the new range, sample standard deviation and IQR of the new data set.

range =(Please enter an exact answer.)standard deviation =(Please show your answer to one decimal place.)IQR =(Please enter an exact answer.)

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

• standard deviation
• IQR
• Range