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lidiya [134]
3 years ago
12

A field having length 120 ft and width 90 ft has a square pond with edge 20ft. find the area of the field excluding the pond​

Mathematics
1 answer:
Ivahew [28]3 years ago
6 0

Answer:

pogi ko nga

Step-by-step explanation:

ako pogi

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A multiple choice exam has ten questions. Each question has five possible answers, of which one is correct. Suppose that a stude
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Answer:

8.81% probability that the student answers exactly 4 questions correctly

Step-by-step explanation:

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

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

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This means that n = 10

The probability of answering any question correctly is 0.20.

This means that p = 0.2

What is the probability that the student answers exactly 4 questions correctly

This is P(X = 4).

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 4) = C_{10,4}.(0.2)^{4}.(0.8)^{6} = 0.0881

8.81% probability that the student answers exactly 4 questions correctly

4 0
4 years ago
What is two and seven eights as an improper fraction?
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Answer:

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