To prove that 61 is a Prime number.
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The mean is the average. You simply add all the numbers and divide by how many numbers there are. So the mean of 16 numbers would be the sum of all 16 numbers, divided by 16.
The set of prime factors of the numbers from 1 to 15,000 would be the set of prime numbers between 1 and 15,000. The link below has a list of the first 10,000 prime numbers, so if you take the primes less than 15,000, you will have the set of prime factors of the first 15,000 numbers. For prime factors of individual numbers, check the related question, "What are the prime factors of the numbers from 1 to 200?" Also check for WikiAnswers questions in the form of "What are the prime factors of __?" and "What are the factors and prime factors of __?"
Euclid (c. 300 BC) was one of the first to prove that there are infinitely many prime numbers. His proof was essentially to assume that there were a finite number of prime numbers, and arrive at a contradiction. Thus, there must be infinitely many prime numbers. Specifically, he supposed that if there were a finite number of prime numbers, then if one were to multiply all those prime numbers together and add 1, it would result in a number that was not divisible by any of the (finite number of) prime numbers, thus would itself be a prime number larger than the largest prime number in the assumed list - a contradiction.
1. you add up all of the numbers that you have. And then you divide the number of numbers you had so if i did 6,5,7 i would do 6+5+7=18 then i have three numbers so divide 18 by 3=6 and that would be my answer
Add the numbers, then divide by three. I don't know vb script, but in most programming languages it would be something like this: result = (a + b + c) / 3