amf14
13.12.2019 •
Mathematics
The fsw bookstore has determined that their daily revenue has a population mean of $500 and a population standard deviation of $80. assume that the daily revenue is normally distributed. if 1000 days were selected independently from this population then what would be the expected number of days for which the daily revenue is $400 or less?
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Ответ:
Expected number of days for which the daily revenue is $400 or less is 105.6
Step-by-step explanation:
Expected number of days for which the daily revenue is $400 or less can be written as
P(X<=400) where X is a variable in the distribution of daily revenue of the bookstore.
P(X<=400) = P(z<z*) where z* is the z-score of $400 in the distribution
z* can be calculated as:
z*= where
X = $400M is the population mean of daily revenue ($500)s is the population standard deviation ($80)Then z*= =-1.25
From this P(z<z*)≈0.1056
Finally, expected number of days for which the daily revenue is $400 or less in the selected 1000 days is 1000×0.1056=105.6
Ответ:
there is a rhombus made by the middle triangles, there is a trapezoid made by the 3 triangles at the top and there is an equilateral triangle made by the 3 triangles at the bottom and one in the middle
Step-by-step explanation: