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
Sliva [168]
3 years ago
12

Jessica doesn't have any idea of what the answer is on one of her multiple choice questions like this problem. The problem has 4

possible choices. After she guesses the answer, she realized that she has a 25% chance of getting that question correct. What type of probability did she use?
Mathematics
1 answer:
leva [86]3 years ago
8 0
Random probability, if that’s an answer.
You might be interested in
g: Consider the following game. A coin is flipped. If it lands tails we stop playing and winnothing. If it lands heads we spin a
galben [10]

Answer:

E[W] = $25 (assuming the currency is in dollars)

Var(W) = 1041.67

Step-by-step explanation:

Probability of winning first starts with the coin toss.

For a win, the coin needs to land on heads.

Probability of that = 1/2 = 0.5

Then probability of winning any amount = 1/100 = 0.01

Total probability of winning any amount = 0.5 × 0.01 = 0.005

But expected value is given by

E(X) = Σ xᵢpᵢ

where xᵢ is each amount that could be won

pᵢ is the probability of each amount to be won and it is the same for all the possible winnings = 0.005

So,

E(W) = Σ 0.005 xᵢ

Summing from 0 to 100 (0 indicating getting a tail from the coin toss). This could be done with dome faster with an integral sign

E(W) = ∫ 0.005 x dx

Integrating from 0 to 100

E(W) = [0.005 x²/2]¹⁰⁰₀

E(W) = [0.0025 x²]¹⁰⁰₀ = 0.0025(100² - 0²) = 0.0025 × 10000 = $25

Variance is given by

Variance = Var(X) = Σxᵢ²pᵢ − μ²

μ = expected value

We calculate the expression, Σxᵢ²pᵢ which is another sum from 0 to 100

Σxᵢ²pᵢ = Σ 0.005xᵢ²

Σ 0.005 xᵢ² = ∫ 0.005 x² dx

Integrating from 0 to 100

∫ 0.005 x² dx = [0.005 x³/3]¹⁰⁰₀ = [0.1667x³]¹⁰⁰₀ = 0.1667(100³ - 0³) = 1666.67

Var(W) = 1666.67 - 25² = 1666.67 - 625 = 1041.67.

5 0
3 years ago
Which statement is true about this data set?<br> 3,1, 6, 4, 4, 4, 3, 2, 5, 3
Kobotan [32]

Answer:

What statements?

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Find the area and perimeter of the following
suter [353]

Answer:

Perimeter is 8x²y+26x

Area is 52x³y

Step-by-step explanation:

The perimeter is 2W+2L and area is LW

Perimeter:

2(4x²y)+2(13x)

8x²y+26x

Area:

(4x²y)(13x)

52x³y

3 0
2 years ago
The larger of two numbers is five more than twice the smaller number. The sum of the two numbers is 38. Find the numbers.
White raven [17]

Answer:

11 and 16

Step-by-step explanation:

A good way to solve these is to work backwards.

X= larger and Y= smaller

if X is 5 more than 2Y than subtract 5 from the total

38 - 5 = 33

divide by 3

33/3 = 11

11 = Y and double that is 22 so add the five back into X and you get 16

8 0
3 years ago
I need help with this (write an inequality)​
kipiarov [429]

Answer:

A.)x-9>20

B.) x-7>12

C.) 8×y>16

D.) y÷7 ≤-5

3 0
3 years ago
Read 2 more answers
Other questions:
  • Who had this before if so can I get help
    12·1 answer
  • I need this done plz
    12·1 answer
  • Describe the relationship between the value of a dollar and the value of a dime
    9·2 answers
  • Where is tge vertex of the graph of y=-x^2
    8·1 answer
  • What is the advantage to exercise?
    8·1 answer
  • The diagram up there shows the breadth of a rectangle
    10·1 answer
  • X+4 what is the value of x
    6·1 answer
  • Hello any help would be appreciated ❤ Thank you ❤
    6·2 answers
  • What is 6/5 divided by 4/10
    14·2 answers
  • all you need is in the photo please answer fast please helpppppp DON'T DO STEP BY STEP PUT ONLY THE ANSWER PLEASEEEEEEEEEEEEEEEE
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!