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Shalnov [3]
3 years ago
5

Amit is going to guess on all

Mathematics
2 answers:
tigry1 [53]3 years ago
7 0

Answer:

Close to five but not exactly 5

Step-by-step explanation:

Khan Academy

Papessa [141]3 years ago
4 0

Answer:

The best prediction for the number of questions that Amit will answer correctly is 5.

Step-by-step explanation:

Each question can be considered as an independent Bernoulli trial. This implies that we have 20 independent trials.

Now, the probability of making a correct guess on each question is;

1/4. This is because we have 4 choices per question and only 1 is correct.

If we now let the random variable X denote the number of questions that Amit will answer correctly, then X is a Binomial random variable with parameters;

20 and 1/4.

The expected number of correct answers is simply the product of these two values;

20 * (1/4) = 5

Therefore, the best prediction for the number of questions that Amit will answer correctly is 5

You might be interested in
The length of a rectangle is 3 more yrd than twice the width. The area is 869yrd^2
Otrada [13]

Width=20.108 yrd and Length=43.216 yrd

Step-by-step explanation:

Let width = w

Length =3+2w

Area = 869 yrd^2

We need to find length and width of rectangle.

The formula used is:

Area= length*width

Putting values:

Area= length*width

869= (3+2w)*(w)

869= 3w+2w^2

2w^2+3w-869=0

Using quadratic equation to find value of width w:

w=\frac{-b\pm\sqrt{b^2-4ac}}{2a}

a=2, b=3 and c=-869

w=\frac{-3\pm\sqrt{(3)^2-4(2)(-869)}}{2(2)}

w=\frac{-3\pm\sqrt{6961}}{4}

w=\frac{-3\pm 83.4}{4}

w=\frac{-3+83.4}{4}\,\,and\,\,w=\frac{-3-83.4}{4}

w=20.108\,\,and\,\,w=-21.6

Since width can't be negative so, width w=20.108

Length will be: L=3+2w = 3+2(20.108)=3+40.216=43.216

So, Width=20.108 yrd and Length=43.216 yrd

Keywords: Area of rectangle

Learn more about Area of rectangle at:

  • brainly.com/question/3306327
  • brainly.com/question/6270221
  • brainly.com/question/6564657

#learnwithBrainly

4 0
3 years ago
PLEASE !! I need this question as fast as possible pleasee
steposvetlana [31]
X^2=-5x+8
x^2+5x-8=0
put in quadratic formula(in image)
Answer is A.
(I need all the points I can get lol)
If you need help, feel free to message me.
7 0
3 years ago
Anyone know how to check solution, please help if u do
Ivenika [448]
Let's check your answer. To do this, you would simply plug your answer into the equation and see if it works. 
5(y - 3) - 2 (3 - 2y) = 6
5(3 - 3) - 2(3 - 2 × 3) = 6

The equation works! 

Y = 3

Great work!

3 0
3 years ago
Write the integer that represents the opposite of each situation<br> 100 feet above sea level
Sveta_85 [38]
The answer is 100 m below sea level
6 0
3 years ago
25 dollars as an interger
strojnjashka [21]

Answer:

-25

Step-by-step explanation:

Hope this helps! :)

5 0
3 years ago
Read 2 more answers
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