3. The waiting time in a doctor's surgery is normally distributed with mean 15 minutes and...
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3. The waiting time in a doctor's surgery is normally distributed with mean 15 minutes and standard deviation 4.2 minutes. (i) Find the probability that a patient has to wait less than 10 minutes to see the doctor. [3] (ii) 10% of people wait longer than 7 minutes. Find T. [3] (iii) In a given week, 200 people attend the surgery. Estimate the number of these who wait more than 20 minutes. [3] 3. The waiting time in a doctor's surgery is normally distributed with mean 15 minutes and standard deviation 4.2 minutes. (i) Find the probability that a patient has to wait less than 10 minutes to see the doctor. [3] (ii) 10% of people wait longer than 7 minutes. Find T. [3] (iii) In a given week, 200 people attend the surgery. Estimate the number of these who wait more than 20 minutes. [3]
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