In order to study the effectiveness of a training program, president kirkman randomly picks 5 employees and records the respective time taken in assembling part k. of the times are 8, 7, 9, 6, and 10 minutes, what is the standard deviation

The standard deviation of the sample is 1.58.

We calculate the standard deviation as follows:

Let time taken by employees be t

Let the Mean time (average) taken by employees be

               t                   t -     (t - )²

              8                                      

               7                                          

              9                                        

              6                                    

             10                                    

Total     40                                                                              10      

We find the mean or average as follows:

The formula for calculating the standard deviation of a sample is:

answer is i don't know

it should be