Addition Rule of Probability
It simply refers to the likelihood of an event taking place whenever the occurrence of an event is uncertain. The probability of a single event can be calculated by dividing the number of successful trials of that event by the total number of trials.
Expected Value
When a large number of trials are performed for any random variable ‘X’, the predicted result is most likely the mean of all the outcomes for the random variable and it is known as expected value also known as expectation. The expected value, also known as the expectation, is denoted by: E(X).
Probability Distributions
Understanding probability is necessary to know the probability distributions. In statistics, probability is how the uncertainty of an event is measured. This event can be anything. The most common examples include tossing a coin, rolling a die, or choosing a card. Each of these events has multiple possibilities. Every such possibility is measured with the help of probability. To be more precise, the probability is used for calculating the occurrence of events that may or may not happen. Probability does not give sure results. Unless the probability of any event is 1, the different outcomes may or may not happen in real life, regardless of how less or how more their probability is.
Basic Probability
The simple definition of probability it is a chance of the occurrence of an event. It is defined in numerical form and the probability value is between 0 to 1. The probability value 0 indicates that there is no chance of that event occurring and the probability value 1 indicates that the event will occur. Sum of the probability value must be 1. The probability value is never a negative number. If it happens, then recheck the calculation.
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48
Chapter 2 Matrices
See CalcChat.com for worked-out solutions to odd-numbered exercises.
Equality of Matrices In Exercises 1-4, find r and y.
Finding Products of Two Matrices In Exercises 15-28,
find, if possible, (a) AB and (b) BA
15. A - *-|-
16. A - [
2.:-:
16 4 5 4
5 4] [ 16
4
4 2r +1
15 3x
0 2 4 0] lo 2 3y - 5
[2
17. A-5
[2
2 -1
31
3. -3 13 15 6--3 13
I -2
-2. B-
-4
3]
-4 -1 -2
*+ 2
I 2y
7 -2 y+ 2
8 -3
18 -8
7 -2 11
8
-3
2x + 6
71
8. B-2
i -1
4.
18. A = 2 -1
3
i -3
[o -1
B-4
6
01
Operations with Matrices In Exercises 5-10, find, if
possible, (a) A + B, (b) A - B, (c) 24, (d) 24 - B, and
(e) B+ A.
2
19. A--3
8 -1
7.
3
2
2
5. A =
B-
20. A--3
4 -2
4
0
4
B-2
6.
6 -1
-4
6. A-
4
B--1
-3
5
10
21. A- [3
11 B
-3
7. A=
-1
-3
[3
8. A-2
[o
2 -1
2
I 3
3 21
B-5
22. A-
B- (2
4
4
2
I 2]
9. A=
-4
23. A
4
B
10. A-
2. B-(-4
21
6
-1]
24. A=
11. Find (a) c, and (b) e where C- 2A - 38,
-1
4
[1
2 -7
and B=
-1
|-3
o -5
25. A-4
2
B-
12. Find (a) c, and (b) c. where C = SA + 2B,
4 II -9
3
8
-1
7
2
4
A-
2. and B-
6 II
26. А
3 -1 -2
1-
2 -3 -1
-3
-6
4
-2
-2
3
13. Solve for x. V, and z in the matrix equation
6
-2
27. A=
B = [10 12)
14. Solve for x, V. and w in the matrix equation
28. A=
13
8 -17
2.1 Exercises
49
Matrix Size In Exercises 29-36, let A, B, C, D, and F
be matrices with the sizes shown below.
Writing a Linear Combination In Exercises 49-52,
write the column matrix bas a linear combination of the
columns of A.
A: 3 x4 B: 3 x4 C: 4 x 2 D: 4 x 2 E: 4 x3
If defined, determine the size of the matrix. If not
defined, explain why.
49. A = ;3 -
41
2. b
29. A + B
30. C+E
2
31. D
32. -4A
50. A --1
3
33. AC
34. BE
[1
51. A-I
35. E- 24
36. 2D + C
-1
b-1
Solving a Matrix Equation In Exercises 37 and 38,
solve the matrix equation Ax = 0.
[2
- 1
-3
-22
37. A-
52. A
3
b
4
21
4 -8
32
Solving a Matrix Equation In Exercises 53 and 54,
solve for A.
3
38. A -1
-1
-1
2
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