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ollegr [7]
3 years ago
9

HELP ASAP AND ILL GIVE U BRAINLIEST !!!!!!!!!!!!

Mathematics
2 answers:
olchik [2.2K]3 years ago
6 0

Answer:

i beleive it is the 3rd choice

Step-by-step explanation:

avanturin [10]3 years ago
5 0
I think answer is 2222222
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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

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3 years ago
Given: -16 = m/5 -18; <br> Prove: m=10
spayn [35]

Answer:

I have proven m is 10. have a good day and give brainliest if possible.

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2 years ago
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Answer:

18 yards of material needed to make 24 shirts

Step-by-step explanation:

The unit rate is

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This rate could also be written as 3/4 yard per shirt

Multiply this latter rate by 24 shirts:

 3 yard

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 4 shirt

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