The numbers 8 9 11 15 17 21 and N are arranged in ascending order The mean of these numbers is equal...........

Quantitative Aptitude (MTS) Statistics

The numbers 8, 9, 11, 15, 17, 21 and N are arranged in ascending order. The mean of these numbers is equal to the median of

the numbers. The value of N is:

This questions was previously asked in

SSC MTS 18th October 2021 Shift-2

- Ascending order arrangement: 8, 9, 11, 15, 17, 21, N.

- Median is the middle number when sorted, i.e., the 4th number.

- Mean (average) equals the median.

- Median candidate: 15, since it's the 4th number.

- Calculate mean by assuming the median:

\frac{8 + 9 + 11 + 15 + 17 + 21 + N}{7} = 15

- Sum of existing numbers: 81.

- Equation:

\frac{81 + N}{7} = 15

- Multiply by 7:

81 + N = 105

- Calculate N:

N = 24

- Answer: Option 1, 24

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