### Find the difference between the sum of the first 1000000 positive even numbers and the sum of the first 1000000 positive odd numbers?

The sum of the first 1,000,000 positive even numbers is: 2 + 4 + 6 + 8 + ... + 2,000,000 The sum of the first 1,000,000 positive odd integers is: 1 + 3 + 5 + 7 + ... + 1,999,999 The difference between the two is: (2-1) + (4-3) + (6-5) + (8-7) + ... + (2,000,000-1,999,999). This is the same as: 1 + 1 + 1 + 1 + ... + 1…

### How do you calculate the standard deviation of the mean?

First, you need to determine the mean. The mean of a list of numbers is the sum of those numbers divided by the quantity of items in the list (read: add all the numbers up and divide by how many there are). Then, subtract the mean from every number to get the list of deviations. Create a list of these numbers. It's OK to get negative numbers here. Next, square the resulting list of numbers…

### What are the rules in rounding numbers?

If the number ends in 1 2 3 4 round down and round the number up if it ends 5 6 7 8 9 to get rounded to the nearest ten. If the number ends in 1-49 inclusively round down and round the number up if ends with 50-100 inclusively. For bigger numbers like 1000000 half then take away 1 to find the number to round down and the rest is rounded up. e.g. Round…