In the new show The Last of Us there is a fungal infection that spreads rapidly in humans. An epidemiologist who also loves watching TV wonders if this fungal infection would spread at a faster rate in cities than in rural areas. In order to test this hypothesis the epidemiologist studies this same fungal infection in ants. Normally the infection rate is as high as 100 (estimated number of ants that will be infected by one infected ant) in ant colonies. The corresponding population standard deviation is 10. The epidemiologist takes a sample of 1 000 ants (this is very small compared to an average ant colony so it is meant to reflect rural living) and then introduces the fungal infection. As the fungus spreads, the infection rate is recorded as 78. (include 4 decimals) What is U3?

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