12 Doctors are investigating the weights of adult males registered at their surgery. One week they collect a sample by noting the weight in kilograms of all the adult males who have an appointment at their surgery.
- State the sampling method they use.
- Explain why this method will not generate a simple random sample of all the adult males registered at their surgery.
They represent the data using a histogram.
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An incomplete frequency table for the data is shown below.
| Weight in kg | \(50 -\) | \(65 -\) | \(75 -\) | \(80 -\) | \(90 -\) | \(100 - 120\) |
| Frequency | | 8 | | | | |
- Complete the copy of the frequency table in the Printed Answer Booklet.
One of these patients is selected at random.
- Determine an estimate of the probability that he weighs either less than 60 kg or more than 110 kg .
- Explain why your answer to part (d) is an estimate and not exact.