Time between failures (in months) of a particular bearing is assumed to follow normal

distribution. The data collected over 50 failures are

11.394 10.728 6.680 8.050 8.382

8.740 8.287 7.979 5.857 13.521

12.000 9.496 9.248 6.529 12.137

11.383 8.135 11.752 10.040 8.615

8.686 6.416 9.987 11.282 4.732

9.344 7.019 6.735 12.176 4.247

10.099 6.254 5.557 9.376 5.780

7.129 7.835 9.648 4.381 5.801

8.334 9.454 8.486 7.256 10.963

10.544 10.433 10.425 10.078 7.709

Using Kolmogorov-Smirnov test, check whether the distribution follows normal.