A weld inspector VE weld seams of a ship produced according to the American of Shipping Classification Rules. Welds seems that exhibit some visual signs of poor quality (P) or medium quality

(M) are examined further using a nondestructive testing method (NDE). A sample of 100 weld seams has the following results of poor (P), medium (M), and high (H) quality:

Determine the joint probability mass function and the marginal probability mass functions of VE and DE. Are the random variables statistically uncorrelated? Why? How effective is the visual inspection?

Transcribed Image Text:

NDE= P Nondestructive M Examination H 7320 P VE = Visual Examination M H 555 5 0 5 10 70