The numbers of members in 6 yoga clubs are 80, 74, 77, 71, 75, and 91. find the population standard deviation of the numbers of members to the nearest tenth.

Mean = 78
x - mean         squared

80-78 = 2              4
74-78= -4            16
77-78 = -1             1
75-78 = -3             9
91-78 = 13        169

  Total               199

standard deviation  = square root  (199/6) =  5.8 to nearest tenth