5.76 The “worst-case” requirements are defined in the design objectives for a brand of computer terminal.

A quick preliminary test indicates that 4 out of a lot of 10 such terminals failed the “worst-case” requirements.

Five of the 10 are randomly selected for further testing. Let Y denote the number, among the 5, that failed the preliminary test. Find the following.

a P(Y 1) b P(Y 3)

c P(Y Ú 4) d P(Y Ú 5)

Ú Ú