Which reduced englands population by half between 1348and 1379

I believe the answer to this is Black Plague.

The black plague or the black death as some people like to call it was transferred to the people by rodents who had it, they would get black death from fleas that were already sick. This spread throughout England and France.

Hope this helped :)

Have  a great day

the median of the data is 4.5.

the real answer is b. scintillation counter