How is greg so sure that one of the median numbers will be a ‘5’. It can be 4 and 6 too.
Are you sure? Try plugging in a value for a, so that you can get 4 and 6, and then arrange the list in ascending order.
it doesnt work out indeed, but greg said it at the very beggining.
How did he deduce that?
The question says median is 5. There is already a 5 on the list. That eliminates the possibility of 4 and 6 being the median numbers.