Appendix ASOLUTIONS TO SELECTED EXERCISES
More detailed answers for all of the exercises are located at http://dornsife.usc.edu/labs/rwilcox/books/ in the file answers_wiley.pdf.
Chapter 1
3. sum(x)/length(x) 4. sum(x[x>0]) 5. id=which(x==max(x)) mean(x[-id]), which returns 1.25. 6. The values are 
and 
. 7. The average is 24.1. 9. sum(x)/length(x) returns 4.8. x-4 subtracts 4 from each value. 10. sum(x-mean(x)) returns 1.776357e
15, where e
15 means 
. The exact value is zero. 11. Two commands: id=!is.na(m[,1]) and m[id,]
Chapter 2
1. (a) 22, (b) 2, (c) 20, (d) 484, (e) 27, (f) 
, (g) 2, (h) 220, (i) 12, (j) 54. 2. (a) 
, (b) 
, (c) . 4. (a) , , (b), . 5. , . 6. 338.1. 7. (a) 30.6, (b) 120.6, ...
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