Answer:
Step-by-step explanation:
Given that a man with 5 keys wants to open his door and tries the keys at random.
Exactly one key will open the door.
Assume that unsuccessful keys are NOT eliminated from future trial.
So the probability of choosing correct key = 0.2 = constant since unsuccessful key is not eliminated
X = no of trials required to open the door
We find that X is discrete taking values 1,2....infinity because there is a chance that continuously unsuccessful keys are drawn
P(X=x) = Prob that x-1 trials are unsuccessful and xth trial is successful
=
, x=1,2.....
is the pdf of X
This is a Geometric distirbution.
Answer:
D: (2x + 20°) + x° = 180°
Step-by-step explanation:
Supplementary angles add up to 180°, so that rules out A and C as possible answers.
Answer B has only one angle, so that is out too.
2x + 20° represents one angle, and x represents the other angle
<em>Greetings from Brasil...</em>
Here is the problem:
[(15X - 8)/3] + [(9X - 3)/2]
<em>Let's multiply everything by 6</em>
[6.(15X - 8)/3] + [6.(9X - 3)/2]
[2.(15X - 8)] + [3.(9X - 3)]
30X - 16 + 27X - 9
<h3>57X - 25</h3>
The answer is letter C)
Because 3x6=18
18-1=17
Hey there!
19 is rounded to 20
120 divided by 6=20
20 is your answer
Hope this helps!