It is 1.
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The average is 2 - Adding all the numbers together gives a total of 42. There are 21 numbers in the range - therefore the average is 2.
The arithmetic mean is 36.
it is 33; you can add all up and divide by 17, or simply add first and last and divide by 2
The sum of all integers between 45 and 90 is 3105.
The sum of the integers 1 to 99 is 4950. An easy way to figure this out is using the equation N*(N+1)/2 where N is the largest number in the set.