the number of hoses on the full-service island in use at that time . The joint pint of X and Y appears in the accompanying tabulation .* P ( X , Y )...

• Attachment 1
• Attachment 2

the number of hoses on the full-service island in use at that time . The joint pint of X and Y appears in the accompanying tabulation .*P ( X , Y )20. 050. 070 . 03X0. 05a0. 050. 090 . 10 . 12