A telecommunications company commissioned a study to investigate the amount of time that people spend on phone calls. The study found that the length of time that people spend on a phone call is approximately normally distributed with a mean of 423 seconds and a standard deviation of 80.1 seconds.

Calculate the standardized value (z) for a time of 560 seconds. Give your answer to 2 decimal places.

z = ____

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The standardised value is calculated as z x ... View the full answer