Call:
lm(formula = CpuTime ~ LinesOut + Steps + MountedDevices, data = cpu)

Residuals:
      Min        1Q    Median        3Q       Max 
-0.074914 -0.020733  0.001676  0.016939  0.090459 

Coefficients:
                Estimate Std. Error t value Pr(>|t|)    
(Intercept)    1.466e-03  1.071e-02   0.137 0.891959    
LinesOut       2.109e-05  2.709e-06   7.786 4.64e-09 ***
Steps          9.241e-03  2.096e-03   4.408 9.90e-05 ***
MountedDevices 1.218e-02  2.883e-03   4.225 0.000169 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.03459 on 34 degrees of freedom
Multiple R-squared: 0.9362,     Adjusted R-squared: 0.9306 
F-statistic: 166.4 on 3 and 34 DF,  p-value: < 2.2e-16