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071 Answers 13 Anya calls Zara once each evening before she goes to Calls mobile bed. She calls Zara's mobile 08 Does not answer phone with probability 0.8 or her landline. The probability Answers that Zara answers her mobile phone is 0.74. and the Calls landline Does not answer probability that she answers her landline is y. This information is displayed in the tree diagram shown. a Given that Zara answers 68% of Anya's calls, find the value of v. b Given that Anya's call is not answered, find the probability that it is made to Zara's landline