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
Burka [1]
3 years ago
6

ramone has 5 difficult questions left to answer on a multiple choice test. Each question has 3 choices. For the first 2 of these

questions, he eliminated 1 of the 3 choices. find the probability that he will answer the first 2 questions, as well as at least 2 of the 3 remaining questions correctly.
Mathematics
1 answer:
olchik [2.2K]3 years ago
5 0
1. a b c
2. a b c
3. a b c
4. a b c
5. a b c

then she eliminated 1 choice in 1 and 2, say as follows

1.    b c
2. a b 
3. a b c
4. a b c
5. a b c

Probability of answering correctly the first 2, and at least 2 or the remaining 3 is 
P(answering 1,2 and exactly 2 of 3.4.or 5.)+P(answering 1,2 and also 3,4,5 )

P(answering 1,2 and exactly 2 of 3.4.or 5.)=
P(1,2,3,4 correct, 5 wrong)+P(1,2,3,5 correct, 4 wrong)+P(1,2,4,5 correct, 3 wrong)
also P(1,2,3,4 c, 5w)=P(1,2,3,5 c 4w)=P(1,2,4,5 c 3w )
so  
P(answering 1,2 and exactly 2 of 3.4.or 5.)=3*P(1,2,3,4)=3*1/2*1/2*1/3*1/3*2/3=1/4*2/9=2/36=1/18

note: P(1 correct)=1/2
         P(2 correct)=1/2
         P(3 correct)=1/3
         P(4 correct)=1/3
         P(5 wrong) = 2/3

P(answering 1,2 and also 3,4,5 )=1/2*1/2*1/3*1/3*1/3=1/108

Ans: P= 1/18+1/108=(6+1)/108=7/108
You might be interested in
Log10 (2x + 1) - logio(3x - 2) = 1​
Pavlova-9 [17]

Answer: x=3/4

Step-by-step explanation:

To solve, first express the left side as one logarithm. To do so, apply the quotient rule which is log_bM/N=log_bM-log_bN .

log((2x+1)/(3x-2))=1

Then, express the equation to its equivalent exponential form to eliminate the logarithm.

Note that the exponential form of log_b M=a is M=b^a .

Since the base of the logarithm in the given equation is not written, it indicates that its base is 10.

So re-writing the equation, it becomes:

log_10((2x+1)/(3x-2))=1

And its exponential form is:

(2x+1)/(3x-2)=10^1

(2x+1)/(3x-2)=10

Now that the equation has no more logarithm, the next step is to remove the x in the denominator.

To do so, multiply both sides by 3x-2.

(3x-2)*(2x+1)/(3x-2)=10*(3x-2)

2x+1=30x-20

Next, combine like terms.

To combine 30x and 2x, bring them together on one side of the equation. So, move 2x to the right side by subtracting both sides by 2x.

2x-2x+1=30x-2x-20

1=28x-20

To combine 20 and 1, bring them together on the side opposite the term with x. So, add both sides by 20.

1+20=28x-20+20

21=28x

And, divide both sides by 28 to have x only at the right side.

21/28=(28x)/28

3/4=x

Hence, the solution to the given equation is x=3/4 .

3 0
3 years ago
75dollars with a 10 percent sales tax
Afina-wow [57]
With a 10 percent tax, you have 90 percent left. 75*.9=$67.50
4 0
3 years ago
Read 2 more answers
(−6)^2<br> Need halp please
ziro4ka [17]
This is an EXPONENT. 

To do this all we need to do is multiply the base by itself how many times the power says.

(-6)² = (-6) × (-6) = 36

Recall that any negative number times another negative number is positive so that is why this would be positive.  

So, (-6)² = 36

Hope I helped ya!! 
4 0
3 years ago
Read 2 more answers
What is the cube answer to 24
patriot [66]
Do you mean cube root because the cube root of 24 is 2.88 and other repeating decimals
7 0
3 years ago
Read 2 more answers
143 x 2<br> Pls help me please
iren2701 [21]
143 x 2 = 286 because if you mulitpy each by 2 you get 286
7 0
3 years ago
Read 2 more answers
Other questions:
  • Evan is walking 2 1/8 miles to his aunt's house. He has already walked 6/8 mile. How much further does Evan have to go? Solve th
    13·1 answer
  • jasmine sells girl scout cookies for $4 dollars a box jasmine says if sells $265 boxes she will make 2,000 dollars. is the exact
    14·2 answers
  • Katie and 5 friends split the bill evenly.The total cost was $75 How much will each person pay?
    6·1 answer
  • What is the value of 2-2x-3y5 for x = 2 and y = -4?
    7·1 answer
  • Robert jogged 1 2/5 km.his brother jogged 2 1/2 km.Who jogged the longer distance ?how much longer?
    11·1 answer
  • I need help please please please
    13·2 answers
  • According to Greg, perfect cherry pies have a ratio of 240 cherries to 3 pies. How many cherries does Greg need to make 9 perfec
    9·2 answers
  • Find the equation of the line in slope-intercept form containing the points (6, -1) and (-3, 2).
    7·1 answer
  • Where are the residual values shown on a residual plot?
    14·2 answers
  • What is 78 x 9679-L? <br><br> lego yoda is better than baby yoda
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!