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4. (12 pts) As they move, cellphones perform handoffs, i.e. switch the call from one cell to another. During a call, a telephone either performs zero handoffs (Ho), one handoff (H1), or more than one handoffs (Hz). In addition, each call is either long (L), if it lasts more than 3 minutes, or brief (B). The following table describes the probabilities of the possible types of calls. , H2 H 0.1 L 0.1 0.2 B 0.4 0.1 0.1 Answer the following: a. What is the probability that a cellphone makes no handoffs? b. What is the probability that a cellphone makes exactly one handoff? C. What is the probability that a cellphone makes more than one handoff? d. What is the probability that a call is brief? e. What is the probability that a call is long? f. What is the probability that a call is long or that there are at least two handoffs? g. What is the probability that a call is brief or that there are no handoffs