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5

Step-by-step explanation:

IQR is Q3 - Q1

The question is asking for Checkers so disregared the Chess. On the box we see 3 dots. The only in the middle is the median. The one to the right of the median is Q3, and the other one (to the left of the dot) is Q1. The, Q3 = 15 and Q1 = 10. So, 15-10 = 5. Therefore, the IQR of Checkers is 5.!!

(d)

step-by-step explanation:

given: the line in the graph passes through points (5,30) and (6,26).

then, the equation of line is:

now, put y=a(n) and x=n,

hence, option d is correct.