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14.04.2020 •
Mathematics
A population of bolts has a normal distribution with a mean thickness of 20 millimeters, with a standard deviation of 0.01 millimeters.What values lie 2 standard deviations above and below the mean?
A. 19.99 to 20.01 millimeters
B. 19.97 to 20.03 millimeters
C. 19.8 to 20.2 millimeters
D. 19.98 to 20.02 millimeters
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Ответ:
3
Step-by-step explanation:
4x+2=5x-1
4x - 5x = -1 -2
x = 3