mental maths

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Across
  1. 2. expressions with one or more terms with a non-zero coefficient.
  2. 4. number of solution does quadratic equation has
  3. 5. adding all numbers in the data set and then dividing by the number of values in the set.
  4. 7. vertical axis on cartesian plane
  5. 8. statement of equality between two expressions consisting of variables and/or numbers
Down
  1. 1. how likely something is to happen
  2. 3. a number in a set of numbers that appears the most often.
  3. 5. the value in the middle of a data set,
  4. 6. horizontal axis on cartesian plane