Question
x 0 1 P ( x ) 0.3 0.7 The standard deviation of X is closest...
| x | 0 | 1 |
| P ( x ) | 0.3 | 0.7 |
The standard deviation of X is closest to
Homework Answers
Answer #1
Solution:
| x | P(x) | x * P(x) | x2 * P(x) |
| 0 | 0.3 | 0 | 0 |
| 1 | 0.7 | 0.7 | 0.7 |
| Sum | 1 | 0.7 | 0.7 |
Mean = 
X * P(X)
= 0.7
Standard deviation = 
=
X
2 * P(X) -
2
= 0.7
- (0.7)2 = 0.21
Standard deviation =
= 0.4583
The standard deviation of X is closest to 0.4583
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