SOLUTION: Q8: A discrete random variable x has the following probability distribution: [3 Marks] x P(x) 2 0.05 3 0.30 4 0.20 5 ? 6 0.3 7 0.03

Algebra ->  Probability-and-statistics -> SOLUTION: Q8: A discrete random variable x has the following probability distribution: [3 Marks] x P(x) 2 0.05 3 0.30 4 0.20 5 ? 6 0.3 7 0.03       Log On


   

Question 1188062: Q8: A discrete random variable x has the following probability distribution: [3 Marks]
x P(x)
2 0.05
3 0.30
4 0.20
5 ?
6 0.3
7 0.03

Find P(x=5)

Find Mean of probability distribution.
Calculate the variance, and standard deviation of probability distribution.

Answer by ikleyn(53937) About Me  (Show Source):
You can put this solution on YOUR website!
.

1)   To find this questionable number,  subtract the sum of all other given values of  P(x)  from  1.


3)   to calculate the variance and standard deviation of probability distribution,  go to this web-site

https://www.calculator.net/standard-deviation-calculator.html

Find an online calculator there, along with the nice
professional and educational descriptions of this notion and the formula.

Use it and get the answer on your own.