Answer:
Step-by-step explanation:
Given that X denote the number of telephone lines in use at an online business.
The variable x can take values from 0 to 6 and the probability can be tabulated as follows: Cumulative probability is the Prob =P(X<=x)
We want prob that between 2 and 5 lines, inclusive not in use
This is equivalent to
1-[tex]P(2\leq x\leq 5)[/tex]
=[tex]1-F(5)+F(2)\\=1-0.96+0.45\\=0.49[/tex]