Maths crossword

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Across
  1. 3. ____ is the additive identity of integers
  2. 4. the probability of getting a head in flipping a coin is__
  3. 7. the product of 7 negative integers is___ integer
  4. 9. ___ is the difference between the highest and the lowest observation of the data
  5. 10. -1 is the ____
Down
  1. 1. the most occuring observation of the data is known as___ of the data
  2. 2. the value of the variable which satisfies the equation is called the __
  3. 5. ___ is same as the arithmetic mean
  4. 6. the product of a fraction and its____ is one
  5. 8. angle whose measure is 90 degree is a ____ angle