Question 1043562
Probability of none having a deduction more than $1000 is (20/26)(19/25)(18/24)(17/23)(16/22)=
1860480/7893600=0.2357.  Therefore, the probability of at least one is 1-0.2357=0.7643.
The probability of exactly one has the same denominator.
The numerator has 20,19,18,17,and 6, and they can be ordered 5 ways, so multiply those five numbers by 5.
2907000/7893600=0.3683
This makes intuitive sense.  About a quarter of the returns have >$1000, so the expected value is a little larger than 1. The value for 2 is 0.26, not as large as that for 1, and for 3 is 0.0578.