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Black_prince [1.1K]

2 years ago

12

Find -4(3)+(-7) What order should be preformed in this expression

1 answer:

Sergio [31]2 years ago

8 0

Answer:

-19

Step-by-step explanation:

According to bedmas rules, we have to first solve the brackets.

-4(3)+(-7)

-12 + (-7)

Now, let's add

-12 + (-7)

-12 - 7

= -19

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You are to take a multiple-choice exam consisting of 64 questions with 5 possible responses to each question. Suppose that you h

damaskus [11]

Answer:

a) Expected score on the exam is 12.8.

b) Variance 10.24, Standard deviation 3.2

Step-by-step explanation:

For each question, there are only two possible outcomes. Either you guesses the answer correctly, or you does not. The probability of guessing the answer of a question correctly is independent of other questions. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

The expected value of the binomial distribution is:

$E(X) = np$

The variance of the binomial distribution is:

$V(X) = np(1-p)$

The standard deviation of the binomial distribution is:

$\sqrt{V(X)} = \sqrt{np(1-p)}$

64 questions.

So $n = 64$

5 possible answers, one correctly, chosen at random:

So $p = \frac{1}{5} = 0.2$

(a) What is your expected score on the exam?

$E(X) = np = 64*0.2 = 12.8$

(b) Compute the variance and standard deviation of x. Variance =Standard deviation

$V(X) = np(1-p) = 64*0.2*0.8 = 10.24$

Variance 10.24

$\sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{64*0.2*0.8} = 3.2$

Standard deviation 3.2

5 0

3 years ago

Which equation would best help solve the following problem?

timurjin [86]

Y = yo + Vot - (gt^2)/2

0 = 0 + 31t - 4.9 t^2

0 = -4.9 t^2 + 31t

Answer: option A.

6 0

3 years ago

Find the distance between the pair of points (-7, 2) and (-2, 14)

VladimirAG [237]

Step-by-step explanation:

Distance between points (-7, 2) and (-2, 14) is 13

6 0

2 years ago

What is the value of y

kari74 [83]

Answer:

y= -6

Step-by-step explanation:

-2y - 5y= -7y

-7y=42

42/-7=

y= -6

5 0

2 years ago

Quadrilateral EFGH is a scaled copy of quadrilateral ABCD. Select ALL of the true statements.

Anna007 [38]

Answer:

Segment EF is twice as long as segment AB.

The length of segment EH is 16 units.

Step-by-step explanation:

its

8 0

3 years ago