I've attached the problem statement, and used R to find these probabilities. I got to part b, and my probabilities aren't decreasing however, so I'm wondering what I did wrong if anyone can see it.

n=10

> r<-1- pchisq(45,9)

> (36*r)/9

[1] 3.690651e-06

n=25

> r<- 1-pchisq(45,24)

> (36*r)/24

[1] 0.008737591

n=50

> r<- 1-pchisq(45,49)

> (36*r)/49

[1] 0.4672508