### Counting Fish

I need a figure for the fish population in a lake. How does it help to catch and mark 40 fish?

### Statistics - Maths of Real Life

This pilot collection of resources is designed to introduce key statistical ideas and help students to deepen their understanding.

### The Surveyor Who Came to Tea

This article discusses how a survey company carries out its surveys and some of the issues involved.

# Snow and Cholera

##### Age 14 to 16Challenge Level

On proceeding to the spot, I found that nearly all the deaths had taken place within a short distance of the [Broad Street] pump. There were only ten deaths in houses situated decidedly nearer to another street-pump. In five of these cases the families of the deceased persons informed me that they always sent to the pump in Broad Street, as they preferred the water to that of the pumps which were nearer. In three other cases, the deceased were children who went to school near the pump in Broad Street...

With regard to the deaths occurring in the locality belonging to the pump, there were 61 instances in which I was informed that the deceased persons used to drink the pump water from Broad Street, either constantly or occasionally...

The result of the inquiry, then, is, that there has been no particular outbreak or prevalence of cholera in this part of London except among the persons who were in the habit of drinking the water of the above-mentioned pump well.

I had an interview with the Board of Guardians of St James's parish, on the evening of the 7th inst [Sept 7], and represented the above circumstances to them. In consequence of what I said, the handle of the pump was removed on the following day.

• What is Cholera ?
• From the text above [or from your own research using internet resources - see Hint for a starter link] pick out information which supports the parish Board of Guardian's decision to make the Broad Street pump unusable by removing the pump handle.
• Was the decision certain to be correct ?