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Ilia_Sergeevich [38]

2 years ago

12

I have a bag with only red, blue, and green marbles. The ratio of red marbles to blue marbles to green marbles is 1:5:3. There a

re 27 green marbles in the bag. How many marbles are there in the bag?

1 answer:

Setler79 [48]2 years ago

5 0

81 marbles in the bag?

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第 5 个问题 a multiple choice exam has 10 questions. each question has 3 possible answers, of which one is correct. a student knows

tatuchka [14]

The chances that the student was merely guessing is 1/3.

Bayes Theorem determines the conditional probability of an event A given that event B has already occurred.

denoted by

$P(A/B)=\frac{P(A)*P(B/A)}{P(B)}$

let A be the event that the student knows the answer .

B be the event that the student does not knows the answer .

and

E be the event he gets answer correct .

According to the given question

$P(A)=\frac{4}{10} \\\\ P(B)=1-\frac{4}{10} =\frac{6}{10}$

Probability that the answer is correct ,given that he knows the answer is

$P(E/A)=1$

Probability that the answer is correct ,given that he guesses it is

$P(E/B)=\frac{1}{3}$ [as the MCQ has 3 options and only one is correct]

We need to find the probability that he guesses the answer given that it is correct.

Required probability $P(B/E)=\frac{P(B)*P(E/B)}{P(A)*P(E/A)+P(B)*P(E/B)}$

Substituting the values we get

$P(B/E)=\frac{\frac{6}{10} *\frac{1}{3} }{\frac{4}{10} *1+\frac{6}{10} *\frac{1}{3} }$

$=\frac{6}{30}*\frac{30}{18} \\ \\ =\frac{6}{18} \\ \\ =\frac{1}{3}$

Therefore , the chances that the student was merely guessing is 1/3.

Learn more about Probability here brainly.com/question/13140147

#SPJ4

8 0

7 months ago

When you add a positive and negative number, how can you tell whether the sum will be positive or Negative?

Lera25 [3.4K]

Answer:

just remember this:

negative x negative = positive

positive x positive = positive

postive x negative = negative

negative x postive= negative

lookon bbcbitesize for adding negatives and positive rule

8 0

3 years ago

PLZ HELP MEEEEEE!!! I have a test and i need help plz help me.

beks73 [17]

Answer:

1.) different, subtract, 14

2.) same, add, -33

3.) same, add, -70

4.) different, subtract, 0

5.) different, subtract, -10

6.) different, add, 12

7.) same, subtract, 3

8.) different, subtract, -4

9.) different, subtract, -4

10.) 14

11.) Mark has more, he has $14 more

12.) 9

13) -13 - 12 = -25

14) 200 - 40 = 60

15) 12 - 3 = 8

6 0

2 years ago

If 4 tsp of salt are needed for 5 dozen cupcakes, how many tsp of salt are needed for 11 dozen cupcakes?

kenny6666 [7]

Answer:

8.8 tsp

Step-by-step explanation:

4/5=x/11

cross multiply

44=5x

44/5=x

x=8.8

5 0

2 years ago

Read 2 more answers

Whats the expanded form of 77,079,101

Gnom [1K]

77000000+79000+100+1

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2 years ago