millanesjamela
26.02.2020 •
Mathematics
Assume that the amount of time that it takes an employee to service a car at an oil change facility follows the uniform probability distribution between 21 and 38 minutes.
What is the standard deviation of this distribution
a.4.91
b.6.62
c.9.75
d.11.8
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Ответ:
Option A - 4.91
Step-by-step explanation:
The formula for theoretical standard deviation of uniform distribution is;
σ = √{(b-a)^2}/12
Now from the question, b = 38 minutes and a= 21 minutes
Therefore, σ = √{(38-21)^2}/12
= √{17^2}/12 = √289/12 = 4.907 which is approximately 4.91
Ответ:
29 / 12
x = 2.42 about