1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vlada [557]
2 years ago
7

In a popular tale of wizards and witches, a group of them finds themselves in a room with unmarked doors which change position,

making it impossible to determine which door is which when the room is entered or reentered. Suppose that there are 4 doors in the room. One door leads out of the building after 3 hours of travel. The second and third doors return to the room after 3.5 and 5 hours of travel, respectively. The fourth door leads to a dead end, the end of which is a 2.5 hour trip from the door.If the probabilities with which the group selects the doors are 0.2, 0.1, 0.2, and 0.5, respectively, what is the expected number of hours before the the group exits the building?E[Number of hours]=__________-
Mathematics
1 answer:
SSSSS [86.1K]2 years ago
7 0

Answer:

Expected number of hours before the the group exits the building = E[Number of hours] = 3.2 hours

Step-by-step explanation:

Expected value, E(X) is given as

E(X) = Σ xᵢpᵢ

xᵢ = each variable

pᵢ = probability of each variable

Let X represent the number of hours before exiting the building taking each door. Note that D = Door

D | X | P(X)

1 | 3.0 | 0.2

2 | 3.5 | 0.1

3 | 5.0 | 0.2

4 | 2.5 | 0.5

E(X) = (3×0.2) + (3.5×0.1) + (5×0.2) + (2.5×0.5) = 3.2 hours

Hope this Helps!!!

You might be interested in
HELP NOW 30 points look at the picture
brilliants [131]

Answer:

30 POINTS

Step-by-step explanation:

7 0
3 years ago
How to simplify 24yz^5/32y^2z
Maurinko [17]
24y*z^5/32y^2*z

24/32 = 3/4
y/y^2 = 1/y
z^5/z = z^4/1

Soo now that they are all simplified the answer is 3z^4/4y
8 0
3 years ago
SOMEONE HELP ME PLEASEEEEE
Sergeu [11.5K]
The answer is b if you do the equation right

5 0
3 years ago
Read 2 more answers
I have 18ones,15hundreds,15tens,and 8 thousands
Oksanka [162]

9668

Explanation:

18 ones, 18x1=18

15 hundreds, 15x100 =1500

15 tens, 15x10=150

8 thousands,8x1000=8000

8x1000=800018+1500+150+8000=9668

<em>Hope</em><em> this</em><em> answer</em><em> correct</em><em> </em><em>:</em><em>)</em>

5 0
3 years ago
The ratios of boys to girls on a soccer league is 2:5. If there are 28 boys, how many girls are playing soccer? EXTRA POINTS! WI
Leviafan [203]
If it’s 2:5 then there should be 70 girls!
4 0
3 years ago
Read 2 more answers
Other questions:
  • The number 4 is in both the domain and the range of the function A(n).
    13·1 answer
  • For which values of the parameter B the following system admits a unique solution [ 1 b 1-b 2 2 0 2–2B 4 0] [x y z] = [1 2 0]
    7·1 answer
  • 1. Which regions contain more than 3 million males​
    14·2 answers
  • 2x+5у = - 18<br> — 3x+y= -7
    12·1 answer
  • −n+(−3)+3n+5 combine like terms
    15·1 answer
  • Triangle ABC ~ triangle DEF and the similarity ratio of triangle ABC to triangle DEF is 43 . If AB = 60, what is DE?
    5·2 answers
  • A faucet is leaking at a rate of 4.2 milliliter per minute. How many gallons of water does the faucet leak per day? Use 1 L = 0.
    5·1 answer
  • Suppose we must choose 4 rooms out of
    13·1 answer
  • Please help a girl out I'm so confused
    7·2 answers
  • M<br> 370<br> N<br> 73°<br> L<br> Find the measure of angle M.<br> m_M=<br> 0
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!