andybiersack154

05.05.2020 • 

Mathematics

It is known that in the absence of treatment, 55% of the patients with a certain illness will improve. The Central Limit Theorem tells us that the percentages of patients in groups of 400 that improve in the absence of treatment are approximately normally distributed.
(a) Find the mean and standard deviation of the normal distribution given by the Central Limit Theorem. Round the standard deviation to one decimal place.
mean
%
standard deviation
%

(b) In what percentage of such groups (of 400) would 215 or fewer improve? Round your answer to one decimal place.
%

Ответ:

Gabr02

19.03.2021

Mathematics

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What you need to do is divide 32 by 40 so you end up with 1%. Then you need to multiply that by 25 and you will get 25%

32÷40=0.8

0.8x25=20

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