Values are 3, 4, 6, 7, 8, 14

Therefore, Mean =

=

= 42/6

= 7

Therefore, sum of deviation of values from their mean

= (3 – 7) + (4 – 7) + (6 – 7) + (7 – 7) + (8 – 7) + (14 – 7)

= (-4) + (-3) + (-1) + (0) + (1) + (7)

= - 8 + 8

= 0