The integer solutions of | 1-3a| less than or equal to 14 are -4, -3, -2,-1, 0, 1, 2, 3, 4, 5.

The average value of the sample data is 0.5, and the variance is (4.52+3.52+2.52+1.52+0.52) * 2 = (20.25+12.25+6.25+2.25+0.25).

The standard deviation is 82.5 root, which is about 9.08.