I am not really sure how to calculate question C. Can anyone help me out? Thanks in advance!

J Jellekool New Member Mar 3, 2018 #1 Mar 3, 2018 #1 I am not really sure how to calculate question C. Can anyone help me out? Thanks in advance! Attachments sadf.png 297.9 KB Views: 3

O obh Member Mar 9, 2018 #2 Mar 9, 2018 #2 I assume join probability mean the probability that x>15 and y>10