Answer Happy

Carbon monoxide (CO) emissions for a certain kind of car are
normally distributed with mean 2.5 g/km and standard deviation 0.28
g/km. A company has 25 of these cars in its fleet. There is only a
3% chance that the fleet’s mean CO level is below than what
value? Round your answer to three decimal
places.
According to a recent study published in Journal of
Infection and Public Health on February 8, 2021, the the
COVID-19 incubation period is a random variable with a mean of
around 5.2 days and a standard deviation is 2.4 days. What is
the probability that the mean incubation period of a randomly
sample of 64 confirmed cases ranges from 4.4 to 5.5
days? Round your answer to four deceimal
places.
Carbon monoxide (CO) emissions for a certain kind of car are
normally distributed with mean 2.5 g/km and standard deviation 0.16
g/km. A company has 16 of these cars in its fleet. There is only a
7% chance that the fleet’s mean CO level is greater than what
value? Round your answer to two decimal
places.