Solve for the unknown variable 5/3(4x-5)=4x-1/3

2 answers:

6 0

Answer:

x=3

Step-by-step explanation:

its should be equal

Ugo [173]3 years ago

3 0

Answer: BRAINLIEST PLZ

x=3

Step-by-step explanation:

5/3(4x-5)=4x-1/3

20x/3 - 25/3 = 4x -1/3 add 25/3 to both sides

20x/3=4x+24/3

20x/3=4x+8 Subtract 4x from both sides

20x/3-4x=8

20x/3 - 12x/3=8

8x/3=8 multiple both sides by 3

8x=24 divide both sides by 8

x=3

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Aleks [24]

Answer:

The variance for the number of correct answers is 2.8 questions

Step-by-step explanation:

The number of correct answers follows binomial distribution, in which we have:

n identical and independents events: the 15 questions
two possibles results that we call success and fail: The answer is correct and the answer is incorrect
probability p of success and 1-p of fail. Probability 1/4 of get the answer correct and probability of 3/4 of get the answer incorrect. This probabilities are calculated on that way because every question have 4 possible answers and one of which is correct.

So, the variance for a variable x that follows a Binomial distributions is:

V(x)=n*p*(1-p)

Then, the variance for the number of correct answers is:

V(x)=15*(1/4)*(3/4) = 2.8125 ≈ 2.8

Because n is equal to 15, p is equal to 1/4 and (1-p) is equal to 3/4.

5 0

3 years ago

seropon [69]

Answer:

$\frac{6-10}{24-0} =\frac{-4}{24}$