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3 years ago

54 POINTS FOR THE ANSWER!

Mathematics

2 answers:

Inessa05 [86]3 years ago

7 0

Answer: C

Step-by-step explanation:

Nitella [24]3 years ago

5 0

Answer:

(0.162 to 0.278)

Step-by-step explanation:

0.22 +/- 1.96(0.029)

0.22 +/- 0.05684

[0.16316 , 0.27684]

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A multiple-choice examination has 20 questions, each with five possible answers, only one of which is correct. Suppose that one

kari74 [83]

Answer:

The probability that the student answers at least seventeen questions correctly is $8.03\times 10^{-10}$ .

Step-by-step explanation:

Let the random variable X represent the number of correctly answered questions.

It is provided all the questions have five options with only one correct option.

Then the probability of selecting the correct option is,

$P(X)=p=\frac{1}{5}=0.20$

There are n = 20 question in the exam.

It is also provided that a student taking the examination answers each of the questions with an independent random guess.

Then the random variable can be modeled by the Binomial distribution with parameters n = 20 and p = 0.20.

The probability mass function of X is:

$P(X=x)={20\choose x}\ 0.20^{x}\ (1-0.20)^{20-x};\ x =0,1,2,3...$

Compute the probability that the student answers at least seventeen questions correctly as follows:

$P(X\geq 17)=P (X=17)+P (X=18)+P (X=19)+P (X=20)$

$=\sum\limits^{20}_{x=17}{{20\choose x}\ 0.20^{x}\ (1-0.20)^{20-x}}\\\\=0.00000000077+0.000000000032+0.00000000000084+0.000000000000042\\\\=0.000000000802882\\\\=8.03\times10^{-10}$

Thus, the probability that the student answers at least seventeen questions correctly is $8.03\times 10^{-10}$ .

4 0

3 years ago

The digit 3 in which number represents a value of 3 tens ?

Korvikt [17]

Answer:

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

A copy machine can print 340 color copies every 8 minutes. Explain or show your reasoning.

mylen [45]

Step-by-step explanation:

340=8min

850=?(x)

340x=850×8

340x=6800

x=6800/340

x=20min

so..the teachertook 20 minute to print 850 copies

3 0

2 years ago

Read 2 more answers

4x + 20 degrees 40 degree angle

Mars2501 [29]

90 degree angle witch is Obtuse angle

welcomeeeee Yasssssssss

8 0

3 years ago

What is the difference in medians of the two box plots? de27a97d-2652-45fd-92f8-2f37a2ac7b09?W=400&h=400

Veronika [31]

*see attachment for the diagram of the two box plots referred to here.

Answer:

2 inches

Step-by-step explanation:

The median of a box plot is the data value that lies exactly where the vertical line divides the box into two.

Therefore:

Median for Class 1 = 17 inches

Median for class 2 = 15 inches

The difference in the medians of both box plots = 17 - 15 = 2 inches

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2 years ago