The average of the first nine prime numbers is:

9

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11

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$11 \frac{1}{9}$

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$11 \frac{2}{9}$

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Solution

The correct option is D $11 \frac{1}{9}$
first nine prime numbers $: 2, 3, 5, 7, 11, 13, 17, 19, 23$

average = sum of numbers / total numbers

$= \frac{2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23}{9}$

$= \frac{100}{9}$

$= 11 \frac{1}{9}$

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The median of first 8 prime numbers is

(a) 7 (b) 9 (c) 11 (d) 13

In a “magic square”, the sum of the numbers in each row, in each column and along the diagonal is the same. Is this a magic square?

1 \times 9 + 2 = 11 12 \times 9 + 3 = 111 123 \times 9 + 4 = 1111 1234 \times 9 + 5 = 11111 12345 \times 9 + 6 = . . . . . . 123456 \times 9 + 7 = . . . . . .

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