An accounting office has six incoming telephone lines. The probability distribution of the number of busy lines, Y, is as follows.

Use random-variable notation to express each of the following events.
The number of busy lines is
a. Exactly four.
b. At least four.
c. Between two and four, inclusive.
d. At least one.
Apply the special addition rule and the probability distribution to determine
e. P(Y = 4).
f. P(Y ≥ 4).
g. P(2 ≤ Y ≤ 4).
h. P(Y ≥ 1).

Transcribed Image Text:

PiY=y)| 0.052 0.154 0.232 0.240 0.174 0.105 0.043