Question

http://imageshack.us/photo/my-images/683/page701.jpg/
I need help number 29,30,31
the key 29 is :0.007
the key 31 is :0.109

Answer 1

add all the no. of students taking different subjects.this is total.
now just divide the no of students of a particular subject by total to get probability in that subject

Answer 2

I did but my answer not math with the key

Answer 3

the answer is right u check it.
total:25405;
29: 179/25405;
31: 2770/25405

Answer 4

thank I have 2 caculator , one correct one not correct

Answer 5

both are right.check it.check in computer