Answer:
260 minutes
Explanation:
the interquartile range ( IQR) is the difference between the upper quartile (Q₃ ) and the lower quartile (Q₁ )
Q₃ is the value at the right side of the box , that is
Q₃ = 400
Q₁ is the value at the left side of the box , that is
Q₁ = 140
Then
IQR = Q₃ - Q₁ = 400 - 140 = 260