Well, it seems that on your system the output is pretty consistent as all the delta values are very similar. On my computer it generates a broader range of values:
null: 4.34, work: 4.53, delta: 0.19
null: 4.70, work: 4.67, delta: -0.03
null: 5.33, work: 6.38, delta: 1.05
null: 4.83, work: 6.05, delta: 1.22
null: 4.68, work: 5.27, delta: 0.58
null: 6.56, work: 5.12, delta: -1.44
null: 4.42, work: 9.26, delta: 4.85
null: 5.26, work: 4.58, delta: -0.68
null: 6.63, work: 5.86, delta: -0.78
null: 4.34, work: 7.54, delta: 3.20
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