The Answer to the Question
is below this banner.
Here's the Solution to this Question
Assume two unknown values are x and y.
Arranging in ascending order,
x, y, 7000, 12000, 12000
Mean = 7000
Also, as there is unimode...(ii)
Also, x, y are in thousands...(iii)
From (i), (ii), (iii)
Now, standard deviation