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Lelu [443]
4 years ago
10

Edward has to take a seven​-question ​multiple-choice quiz in his sociology class. Each question has four choices for​ answers,

of which only one is correct. Assuming that Edward guesses on all seven ​questions, what is the probability that he will answer ​a) all seven questions​ correctly, ​b) exactly three questions​ correctly, ​c) at least three questions correctly.
Mathematics
1 answer:
vovikov84 [41]4 years ago
8 0

I think the answer is c, at least three questions correctly because he wouldn't get all of them right and he can't a get perfect number, 3.

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What is the quotient of 4 1/4 / 2 1/5
Snezhnost [94]

The quotient for the given mixed fraction is 1.9318

Step-by-step explanation:

Step 1; First we must convert the mixed fractions into improper fractions. To do that the whole number is multiplied with the denominator and add with it the numerator while the denominator does not change. To convert this fraction 4\frac{1}{4} we multiply 4 with 4 and then add 1 and keep the 4 as the fraction's denominator so we get \frac{17}{4}. Similarly, we get the improper fraction \frac{11}{5} for converting the mixed fraction 2\frac{1}{5} .

Step 2; After conversion, it's just a matter of division. The fraction \frac{17}{4} equals 4.25 while the denominator \frac{11}{5} equals 2.2. Dividing 4.25 by 2.2 we get 1.9318.

5 0
4 years ago
In what order should a boolean retrieval system merge the related postings for best query efficiency?
Nonamiya [84]

Answer:

For each n get its posting then AND them

Step-by-step explanation:

1. Lets presume we have multiple n terms

2. We get the posting from each n term

3. We use the function AND and apply it to each n term

4. We start with the tiniest set and we continue from there

5. We have a pair of n terms

6. We get the posting from 1st n

7. We get the posting from 2nd n

8. We apply n1 AND n2

4 0
4 years ago
3(x + 1) = −2(x − 1) + 6
Pavel [41]

Answer:

x=1

Step-by-step explanation:

3(x+1)=-2(x-1)+6

1) Distribute 3 to x and 1:

3x+3=-2(x-1)+6

2) Distribute -2 to x and -1:

3x+3=-2x+2+6

3) Combine alike terms:

3x+3=-2x+8

4) Add 2x to both sides:

5x+3=8

5) Subtract 3 from both sides:

5x=5

6) Divide both sides by 5:

x=1

8 0
3 years ago
A club wants to choose a committee of 4 people from its 12 members.
AlladinOne [14]
Hello!
.
The answer to your question is 495 ways.
.
n = 12
r = 4
.
nCr = n1 / (n-r)! r1
12C4 = 12! / (12-4)! 4!
12C4 = 12x11x10x9x8! / 8! 4!
12C4 = 11880 / 24
12C4 = 495
:)
3 0
3 years ago
Read 2 more answers
5. What are 3 true statements you can claim based on
Makovka662 [10]

Answer: 1 hour is equal to 46 miles 2 hours is 92 miles and 20 hours is 920 miles

Step-by-step explanation:

92/2 = 46 miles

46 x 2 = 92 miles

46 x 20 = 920

7 0
3 years ago
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