exercise3():
  Get a datafile in text format from the class website.
  Read the data from the datafile.
  Print the first five lines.
  Compute some statistical measurements.
  Normalize the data, and recompute the statistics.
  When finished, delete the datafile.
  Already have a copy of ruspini_data.txt

  "ruspini_data.txt" contains 75 rows and 2 columns.

  First five lines of data:

  (0)           4        53
  (1)           5        63
  (2)          10        59
  (3)           9        77
  (4)          13        49

  Statistics for data:

  Minimum            4         4
  Maximum      1.2e+02   1.6e+02
  Range        1.1e+02   1.5e+02
  Mean              55        92
  Variance     9.2e+02   2.3e+03
  STD               30        48
  RMS          3.8e+02   6.4e+02
  Graphics saved as "exercise3.jpg"

  k  Inertia

  1  150
  2  75.453
  3  40.0436
  4  10.2241
  5  7.89629
  6  6.29082
  7  4.7641
  8  4.02435
  9  3.47427
  10  2.9659
  Graphics saved as "%s"exercise3_inertia.jpg"

  Deleting dataset file:

exercise3():
  Normal end of execution.