The probability distribution of a random variable x is given. 2 0 -2 -4 x 0.3 0.1 0.3 0.1 0.2 p(x=x) compute the mean, variance, and standard deviation of x. (round your answers to two decimal places.) mean variance standard deviation

Step-by-step explanation:

Given : The probability distribution of a random variable X.

To find : The mean, variance, and standard deviation of X.

Solution :

First we create the table as per requirements,

x      P(x)         xP(x)           x²            x²P(x)

4     0.3           1.2              16              4.8

2     0.1            0.2             4               0.4

0     0.3            0               0                0

-2    0.1           -0.2             4               0.4

-4    0.2          - 0.8            16              3.2

   ∑P(x)=1     ∑xP(x)=0.4               ∑x²P(x)=8.8

1) The mean of x is defined as

2) The variance of x is defined as

3) The standard deviation of x is defined as  

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.