Find the mean, median, standard deviation and range of the data set below. (enter all answers to at least two decimal places)

x
19
17
20
23
25
12
21
15
30


Mean (x‾)\displaystyle \overline{{x}}{)} =\displaystyle =  

Median =\displaystyle =  

Standard Deviation (σ\displaystyle \sigma) =\displaystyle =

Range =\displaystyle =  



Now find the mean, median, standard deviation and range of the data set if we add 9\displaystyle {9} to all of the values.

Mean (x‾)\displaystyle \overline{{x}}{)} =\displaystyle =  

Median =\displaystyle =  

Standard Deviation (σ\displaystyle \sigma) =\displaystyle =

Range =\displaystyle =  

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