chris858232

04.06.2021 • 

Mathematics

2. A survey of 400 statistics professors was undertaken. Each professor was asked how much time was devoted to teaching graphical techniques. We believe that the times are normally distributed with a standard deviation of 30 minutes. The average time of the survey is 120 minutes. Estimate the population mean with 95% confidence.

Ответ:

samanthaepperson

22.04.2022

Mathematics

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A) -4a+16
b) 3a^2+6a
c) 20x - 4x^2- 10 + 2x
-4x^2 + 22x -10
d) x^2+2x-3x-6
x^2-x-6
e) (x+4)(x+4)
x^2+8x+16

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