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3 years ago

12

Deleria says that you

1 answer:

choli [55]3 years ago

7 0

Answer:

She can't do it, as there is not enough information for that.

Step-by-step explanation:

There is no logical way to do this, and I'm not sure which lesson you are doing

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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

I really need help with this algebra problem:<br> 5a=89

stiks02 [169]

Divide 5 by 89 and you get a=17.8

4 0

4 years ago

Alexxx [7]

9514 1404 393

Answer:

14.9 cm

Step-by-step explanation:

To find c using the Law of Sines, you must know angle C. That is found from ...

C = 180° -A -B = 180° -150° -12° = 18°

Then the law of sines tells you ...

c/sin(C) = b/sin(B)

c = b·sin(C)/sin(B) = (10 cm)·sin(18°)/sin(12°)

c ≈ 14.9 cm

5 0

3 years ago

Solve the system of linear equations using Elimination

kakasveta [241]

Alright so after solving it the answer would be x=2 and y= 6

6 0

3 years ago

Read 2 more answers

What is the domain of the function y=√4x+8<br> Can you show your work too, please? (:

kirill115 [55]

$y= \sqrt{4(x+2)}$
$y = 2 \sqrt{x+2}$

The domain would be -2, the x-intercept.

6 0

3 years ago