Anya calls Zara once each evening before she goes to bed. She calls Zaras mobile phone with

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Anya calls Zara once each evening before she goes to bed. She calls Zara’s mobile phone with probability 0.8 or her landline. The probability that Zara answers her mobile phone is 0.74, and the 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 y.

b. Given that Anya’s call is not answered, find the probability that it is made to Zara’s landline.

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Cambridge International AS & A Level Mathematics Probability & Statistics 1 Coursebook

ISBN: 9781108407304

1st Edition

Authors: Dean Chalmers, Julian Gilbey

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Question Posted: Sep 13, 2021 01:31 AM

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Anya calls Zara once each evening before she goes to bed. She calls Zaras mobile phone with

Question:

0.74 Answers Calls mobile 0.8 Does not answer Answers Calls landline Does not ansvw wer versty Pro emyplt

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a Probabilitycalls answered of phone 07408 0592 Probabilitycalls answered of landline 02y 02y Now fi...View the full answer

Cambridge International AS & A Level Mathematics Probability & Statistics 1 Coursebook

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