A scientist investigated the effect of an antibiotic on the treatment of cholera. 320 people with cholera were divided into two groups. One group was treated with the antibiotic while the other group was not given the antibiotic. Both groups were given fluids containing sugars and mineral salts (oral rehydration therapy). The scientist recorded the number of days that each person had diarrhoea. The table shows the results.
What is the percentage decrease in the mean time that a person had diarrhoea when they were treated with the antibiotic?
39.6%
2 )
60.4%
3 )
165.6%
4 )
252.4%
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