This table describes the complaints received by a telecommunications ombudsman…

MATHEMATICS · Multi-part · A Level · Mathematics · Probability · Probability

Problem

This table describes the complaints received by a telecommunications ombudsman concerning internet services over a four year period.
Reason2014/152015/162016/172017/18
Access585112725451612
Billing1822210231363582
Contracts242440719836
Credit control344118136
Customer Service1228211811940
Disconnectionn/an/an/a248
Faults8679120384
Privacy93865760
Provision172122209311
Total3015428280859109
Find the probability that a complaint received: (1) in 2016/17 was about customer service (2) at any time during the 4 year period was related to billing (3) in 2017/18 did *not* relate to either billing or faults.

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