Mathematics: X13 16 18 21 23 25 26 31 p(x) .07 .21 .17 .25 .05 .04 .13 .08 the mean of the discrete random value variable x is the 20.59. what is the variance of x? round your answer to the nearest hundredth a 27.89 b27.89 c33.15 d23.18

X13 16 18 21 23 25 26 31 p(x) .07 .21 .17 .25 - id131618212325263107211725051139503, tricklts15

Ответ:

andrecoral105

14.03.2022

First compute the second moment:

$\mathbb E[X^2]=\displaystyle\sum_x x^2p(x)=13^2\cdot0.07+\cdots+31^2\cdot0.08\approx447.13$

Then the variance of

is

$\mathbb V[X]=\mathbb E[X^2]-\mathbb E[X]^2\approx447.13-20.59^2\approx23.18$

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Ответ:

vicsmi6191

15.08.2021

Mathematics

4

= 2 miles going + 5 miles returning - 3 miles on bike
= 7 miles total walking - 3 miles on bike
= 4 miles excess of walking than biking

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X13 16 18 21 23 25 26 31 p(x) .07 .21 .17 .25 .05 .04 .13 .08 the mean of the discrete random value variable x is the 20.59. what is the variance of x? round your answer to the nearest hundredth a 27.89 b27.89 c33.15 d23.18

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