Check list:

  1. Histograms
  2. Frequency polygons
  3. Ogives (cumulative frequency curves)
  4. Variance and standard deviation of ungrouped data
  5. Symmetrical and skewed data
  6. Identification of outliers

Learn the concepts:
Videos from learn.mindset.co.za
Mind Action Series: Mathematics 11 Textbook & Workbook (2012):
Exercise 1 Page 310
Exercise 2 Page 316
Exercise 3 Page 322
Exercise 4 Page 324
Exercise 5 Page 329
Exercise 6 Page 333
Revision Exercise Page 334
Some Challenges Page 336
Relevant sections from Everything Maths:

Practice the concepts: