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SAT&ACT Math 7 Online
OpenStudy (anonymous):

The length of Paulo’s lunch break follows a normal distribution with mean µ minutes and standard deviation 5 minutes. On one day in four, on average, his lunch break lasts for more than 52 minutes. (i) Find the value of µ. (ii) Find the probability that Paulo’s lunch break lasts for between 40 and 46 minutes on every one of the next four days.

OpenStudy (error1603):

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