A random variable X has the following probability distribution
|
X |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
|
P(X) |
a |
За |
5a |
7a |
9a |
11a |
13a |
15a |
17a |
Then the values of 'a' and P(0 < x < 5) respectively are
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → $\frac{1}{81},\frac{8}{27}$
Given probability distribution
$X:0,1,2,3,4,5,6,7,8$
$P(X):a,3a,5a,7a,9a,11a,13a,15a,17a$
Sum of probabilities equals $1$
$a(1+3+5+7+9+11+13+15+17)=1$
$1+3+5+7+9+11+13+15+17=81$
$81a=1$
$a=\frac{1}{81}$
The reqd probability $P(0<\text{ x }<5)$ corresponds to $X=1,2,3,4$
$P(0<\text{ x }<5)=3a+5a+7a+9a$
$=24a$
$=\frac{24}{81}=\frac{8}{27}$
The values of $a$ and $P(0