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Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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The average of the first 10 odd prime numbers is:
13.8
17
12.9
15.8
15.8
Remember the sequence of prime numbers: 3, 5, 7, 11, 13, 17, 19, 23, 29, 31. Sum them and divide by 10 to get the average.
First 10 odd prime numbers
Average=n∑i=1nxi
Remember the sequence of prime numbers: 3, 5, 7, 11, 13, 17, 19, 23, 29, 31. Sum them and divide by 10 to get the average.
Including '2' as an odd prime number is incorrect, as 2 is the only even prime number.
Identify the first 10 odd prime numbers
Prime numbers are numbers greater than 1 with no divisors other than 1 and themselves. We exclude 2 because it is even. The first 10 odd primes are 3, 5, 7, 11, 13, 17, 19, 23, 29, and 31.
3,5,7,11,13,17,19,23,29,31
Calculate the sum of these numbers
Add the identified numbers: 3+5+7+11+13+17+19+23+29+31=158.
Sum=158
Calculate the average
Divide the sum by the count of numbers (10).
Average=10158=15.8
D is correct because the sum of the first 10 odd prime numbers (3, 5, 7, 11, 13, 17, 19, 23, 29, 31) is 158, and their average is 158 ÷ 10 = 15.8.
Always verify if 1 is included (it is not prime) or if 2 is excluded when dealing with 'odd' prime questions.
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