Maths crossword

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