Question

In: Statistics and Probability

Given the following discrete uniform probability distribution, find the expected value and standard deviation of the...

Given the following discrete uniform probability distribution, find the expected value and standard deviation of the random variable. Round your final answer to three decimal places, if necessary.

Probability Distribution
x 0 1 2 3 4 5 6 7 8 9 10
P(X=x) 1/11 1/11 1/11 1/11 1/11 1/11 1/11 1/11 1/11 1/11 1/11

Solutions

Expert Solution

Solution:

x P(x) x * P(x) x2 * P(x)
0 0.09 0.301 0
1 0.09 0.09 0.09
2 0.09 0.18 0.36
3 0.09 0.27 0.81
4 0.09 0.36 1.44
5 0.09 0.45 2.25
6 0.09 0.54 3.24
7 0.09 0.63 4.41
8 0.09 0.72 5.76
9 0.09 0.81 7.29
10 0.09 0.9 9
1 5.251 34.65

Mean = =  x P (x ) = 5.251

Standard deviation = = x2 P (x ) - ( )2

= 34.65- ( 5.251 )2

=  34.65 - 27.57

= 7.08

= 2.661


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