Advent calendar 2019
16 December
Arrange the digits 1-9 in a 3×3 square so that:
the median number in the first row is 6;
the median number in the second row is 3;
the mean of the numbers in the third row is 4;
the mean of the numbers in the second column is 7;
the range of the numbers in the third column is 2,
The 3-digit number in the first column is today's number.
| median 6 | |||
| median 3 | |||
| mean 4 | |||
| today's number | mean 7 | range 2 |