Answer:
- 1/5
Step-by-step explanation:
Slope of a line passing through two points can be calculated as:
The given points are (-2, -1) and (8, -3). Using the values in above formula, we get:
Thus the slope of the line through the given points is -1/5. So 2nd option gives the correct answer
Step-by-step explanation:
a) Lets start by giving the answer:
The probability distribution of X is:
For every x = 1, 2, 3, 4, 5, 6
Same for Y:
For every y = 1, 2, 3, 4, 5, 6
This is because each variable has 6 possibilities which are equiprobable. In other words, every number (1 to 6) has the same probability of falling uppermost on each dice.
Now if the question refers to a joint probability distribution, then we have a joint random viariable (X,Y). This probability is given by:
For every x = 1, 2, 3, 4, 5, 6 and y = 1, 2, 3, 4, 5, 6
The reason for this is that the combination of the result of both dices produces 36 equiprobable possibilities.
b) For the probability distribution of the sum of the variables we may define:
The for the random variable Z the next results are possible:
Z P(Z)
2 1/36
3 2/36
4 3/36
5 4/36
6 5/36
7 6/36
8 5/36
9 4/36
10 3/36
11 2/36
12 1/36
This is our probability distribution for the sum of X+Y. Now to understand the results lets see some examples:
For z = 2 (x=1 and y=1) we obtain the probability , this is because we have 1 possibility to obtain (1,1) among 36 possibilities.
For z = 4 that is for (x=1, y=3) and (x=2, y=2) and (x=3, y=1) we obtain this is because we have 3 possibilities to obtain any of the combinations mentioned among 36 possibilities.
For z = 10 that is for (x=4, y=6) and (x=5, y=5) and (x=6, y=6) we obtain because we have 3 possibilities to obtain any of the combinations mentioned among 36 possibilities.