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Reggie7079
06.10.2019 •
Mathematics
Groups of adults are randomly selected and arranged in groups of three. the random variable x is the number in the group who say that they would feel comfortable in a self-driving vehicle. find the standard deviation of the random variable x.
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Ответ:
0.789
Step-by-step explanation:
First, find the expected value (the mean).
μ = ∑ x P(x)
μ = (0) (0.359) + (1) (0.436) + (2) (0.180) + (3) (0.025)
μ = 0.871
Next, find the variance.
σ² = ∑(x − μ)² P(x)
σ² = (0 − 0.871)² (0.359) + (1 − 0.871)² (0.436) + (2 − 0.871)² (0.180) + (3 − 0.871)² (0.025)
σ² = 0.622
Finally, find the standard deviation:
σ = √0.622
σ = 0.789
Ответ:
the answer would be (0,0) as this is the only one that works