Solve the rpoblem:
Q: Three tables listed below show "random variables" and their " probabilities. However, only one of these is actually a probability distribution.
A) What is it?
Table 1 Table 2 Table 3
X P(X) X P(X) X P(X)
5 .3 5 .1 5 .5
10 .3 10 .3 10 .3
15 .2 15 .2 15 -.2
20 .4 20 .4 20 .4
B) Using the correct probability distribution, find the probability that x is:
1. Exactly 15.
2. No more than 10.
3. More than 5.
C) Compute the mean, variance, and standard deviation of this distribution