One hundred qualified drivers are selected at random. Out of these 100 drivers, of the 40 drivers who wear spectacles, 30 passed their driving test at the first attempt. Altogether, 25 of the drivers did not pass at their first attempt.

a. Show the data given about the drivers in a clearly labelled table or diagram.

b. Did these drivers pass the test at their first attempt independently of whether or not they wear spectacles? Explain your answer.