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Find the average of the first 10 prime numbers.
12.9
13.5
14.2
15.1
12.9
Memorize the sum of the first 10 prime numbers as 129 so you can instantly divide by 10 without re-adding during the exam.
First 10 prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29
Average=nтИСextPrimesтАЛ
Memorize the sum of the first 10 prime numbers as 129 so you can instantly divide by 10 without re-adding during the exam.
Treating the number 1 as a prime number, which disrupts the correct sequence of primes and yields an erroneous sum.
Identify the First 10 Primes
A prime number is a natural number greater than 1 with no positive divisors other than 1 and itself. The first 10 primes are 2,3,5,7,11,13,17,19,23,29.
P={2,3,5,7,11,13,17,19,23,29}
Calculate the Sum
Add all 10 prime numbers together: 2+3+5+7+11+13+17+19+23+29=129.
Sum=129
Apply the Average Formula
Divide the total sum by the count of numbers (n=10) using the formula Average=10129тАЛ to find the final value.
Average=10129тАЛ=12.9
A is correct because the sum of the first 10 prime numbers is 129, and dividing by 10 gives an average of 12.9.
Questions involving prime numbers and their averages frequently appear in number system properties and data interpretation sets.
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