a)  A random sample of 15 bank customers is selected to see how long (in minutes) they waited in line during the lunch hour, the results are as follows ,

1.2.3.3.3.4.4.5.6.6.8.9.11.13.15,   find the following

A) mean

b) median

c) mode 

d)  range 

e) mean deviation

f) first and third Quartile 

g) semi inter quartile

  h)  standard deviation 

show all necessary workings

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