Question: a large orgonisation promotes its call centre efficiency stating the average time to answer all calls is 7 . 5 minutes with a standard deviation

a large orgonisation promotes its call centre efficiency stating the average time to answer all calls is 7.5minutes with a standard deviation of 2.4minutes. assuming the waiting time duration is approximately normal. what is the waiting time that the associated with the top 10% of customers - for example if you are unlucky enough to be a customer who is subjected to the 10% of longest waiting times.
Answers in excel please

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