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Calculate the mean of the first five prime numbers.
5.6
5.8
6.2
6.4
6
Sum the numbers rapidly by pairing (2+3=5, 7+13=20, add 11) to get 28, then divide by 5 by doubling the sum (56) and placing the decimal (5.6).
The first five prime numbers are required.
Mean=nтИСi=1nтАЛxiтАЛтАЛ
Sum the numbers rapidly by pairing (2+3=5, 7+13=20, add 11) to get 28, then divide by 5 by doubling the sum (56) and placing the decimal (5.6).
Students often incorrectly include 1 as a prime number, leading to an incorrect set of {1, 2, 3, 5, 7}.
Identify the first five prime numbers
Prime numbers are integers greater than 1 with no divisors other than 1 and themselves. The first five primes are 2, 3, 5, 7, and 11.
P={2,3,5,7,11}
Calculate the sum of the prime numbers
Add the identified numbers: 2+3+5+7+11=28.
тИС=28
Calculate the mean
Divide the sum by the count of numbers (n=5): 28/5=5.6.
Mean=528тАЛ=5.6
A is correct because the sum of the first five prime numbers is 28, and their average is 28 divided by 5, which equals 5.6.
Always verify if 1 is excluded from prime number sequences; this is a frequent trap in both elementary number theory and probability questions.
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