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
victus00 [196]
3 years ago
14

Few students manage to complete their schooling without taking a standardized admissions test such as the Scholastic Achievement

Test, or SAT (used for admission to college); the Law School Admissions Test, or LSAT; and the Graduate Record Exam, or GRE (used for admission to graduate school). Sometimes, these multiple-choice tests discourage guessing by subtracting points for wrong answers. In particular, a correct answer will be worth +1 point, and an incorrect answer on a question with five listed answers (a through e) will be worth −1/4 points.
What is the expected value of eliminating one answer and guessing among the remaining four possible answers?
What is the expected value of eliminating three answers and guessing between the remaining two possible answers?
Mathematics
1 answer:
slega [8]3 years ago
6 0

Answer:

Step-by-step explanation:

Assuming there is a punitive removal of one point for an incorrect response.

Five undiscernable choices: 20% chance of guessing correctly -- Expectation: 0.20*(1) + 0.80*(-1) = -0.60

Four undiscernable choices: 25% chance of guessing correctly -- Expectation: 0.25*(1) + 0.75*(-1) = -0.50

I'll use 0.33 as an approzimation for 1/3

Three undiscernable choices: 33% chance of guessing correctly -- Expectation: 0.33*(1) + 0.67*(-1) = -0.33 <== The approximation is a little ugly.

Two undiscernable choices: 50% chance of guessing correctly -- Expectation: 0.50*(1) + 0.50*(-1) = 0.00

And thus we see that only if you can remove three is guessing neutral. There is no time when guessing is advantageous.

One Correct Answer: 100% chance of guessing correctly -- Expectation: 1.00*(1) + 0.00*(-1) = 1.00

You might be interested in
The function B is defined by the equation B(x)=10x+25
kenny6666 [7]

10(6) + 25 = 60 + 25 = 85

10(2.75) + 25 = 27.5 + 25 = 52.5

10(1.482) + 25 = 14.82 + 25 = 39.82

93 = 10x + 25 || 68 = 10x || x = 6.8

42.1 = 10x + 25 || 17.1 = 10x || x = 1.71

116.25 = 10x + 25 || 91.25 = 10x || x = 9.125

4 0
2 years ago
110 minutes as hours in fraction
inessss [21]

Answer:

you divide the number by 60 and get 1.83333333 then you have 1 (whole number with 83333333/100000000

Step-by-step explanation:

8 0
3 years ago
Maribel wants to skate 12 miles on Monday. If she skates io mile Monday morning and į of that distance Monday afternoon, will sh
Alex17521 [72]

Answer & Step-by-step explanation:

Yes, Maribel will reach her goal. If you convert each fraction with a denominator of 6 then add it up, it will be 1 7/6 which is equal to 2 1/6.

I hope this helps ;)

5 0
2 years ago
Bob’s bill for dinner at a Café was $45. In addition he paid 15% tax of the bill, then he paid 15% tip(of the bill without tax).
eimsori [14]
58.50

10%= 4.50
5%= 2.25

6.75*2= 13.50


45+ 13.50= 58.50
6 0
3 years ago
There are exclusions that make the expression 27a^3-1/9a^3-6a+1 undefined
vredina [299]

false I believe.

I hope this helps-

4 0
3 years ago
Other questions:
  • The graph represents function 1 and the equation represents function 2: A graph with numbers 0 to 4 on the x-axis and y-axis at
    9·2 answers
  • A librarian has 274 return books. 50 of the books are reserved at her desk, and the remaining books need to be shelved. Each she
    15·1 answer
  • How can I work this out or solve this?
    12·1 answer
  • Using the expression you found in part a, how many minutes will it take to make and pack an order for 15 parts? Show your work.
    14·2 answers
  • Y=7<br> Y=-2x+1<br><br> Find the intersection
    6·1 answer
  • I dont know what I'm doing! could you help me​
    14·1 answer
  • Ship A sights ship B on a bearing of 308°. What is the bearing of A from B?
    10·1 answer
  • Insert space to express 725895213 in International number<br>system​
    5·1 answer
  • PLSSS HELP IF YOU TURLY KNOW THISS
    5·2 answers
  • Help will name brainliest
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!