1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alik [6]
3 years ago
7

a student ran out of time on a multiple choice exam and randomly guess the answers for two problems each problem have four answe

r choices ABCD and only one correct answer what is the probability that he answered neither of the problems correctly ​
Mathematics
1 answer:
katen-ka-za [31]3 years ago
6 0

Answer:

The probability that he answered neither of the problems correctly ​is 0.0625.

Step-by-step explanation:

We are given that a student ran out of time on a multiple-choice exam and randomly guess the answers for two problems each problem have four answer choices ABCD and only one correct answer.

Let X = <u><em>Number of problems correctly ​answered by a student</em></u>.

The above situation can be represented through binomial distribution;

P(X=r)=\binom{n}{r}\times p^{r}\times (1-p)^{n-r};x=0,1,2,3,....    

where, n = number of trials (samples) taken = 2 problems

           r = number of success = neither of the problems are correct

           p = probability of success which in our question is probability that

                 a student answer correctly, i.e; p = \frac{1}{4} = 0.75.

So, X ~ Binom(n = 2, p = 0.75)

Now, the probability that he answered neither of the problems correctly ​is given by = P(X = 0)

             P(X = 0) = \binom{2}{0}\times 0.75^{0}\times (1-0.75)^{2-0}

                            = 1 \times 1\times 0.25^{2}

                            = <u>0.0625</u>

You might be interested in
What is the value of missing side a ?
Ratling [72]

Answer:

8

Step-by-step explanation:

4x2=8

5 0
3 years ago
Whats 24/6- 4/2 whats the answer dawg
aleksandrvk [35]

Answer:

2

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Solve this problem using the Distributive Property.<br><br> 2 ( 7 + 8 ) =
maria [59]

Answer:

30

Step-by-step explanation:

Original Equation: 2(7 + 8)

So you have to multiply 2 by 7 which equals 14

Then you multiply 2 by 8 which equals 16

Your equation should now look like this: 14 + 16

Add 14 and 16 together.

Your answer is 30

Hope I helped :)

Please condsider brainliest

7 0
4 years ago
Find the quotient of 1 1/4 and 3 1/2 express your answer in simplest form
natta225 [31]

Answer:

11/14

Step-by-step explanation:

11/4 / 3 1/2

3 1/2= 3*2+1= 6+1=7/2

11/4 * 2/7= 22/28

22/2=11

28/2= 14

11/14

4 0
3 years ago
Read 2 more answers
Un paracaidista que pesa 70 N es lanzado de un avión. halla su masa​
77julia77 [94]

Answer:

<em>La masa del paracaidista es 7.14 Kg</em>

Step-by-step explanation:

<u>Peso y Masa</u>

La masa de un objeto es una medida de la cantidad de material que el objeto posee. Sus unidades más comunes son el Kg, gr, lb, Ton.

El peso de un objeto de masa m es la fuerza con la cual la Tierra atrae al objeto a través de la aceleración de gravedad g. Sus unidades son iguales a las de cualquier fuerza, es decir, Nw, Kgf, Dina. Su fórmula es:

P=m.g

Si tenemos el peso P=70 N, podemos calcular la masa, despejándola de la fórmula:

\displaystyle m=\frac{P}{g}

Sustituyendo los valores:

\displaystyle m=\frac{70}{9.8}=7.14\ Kg

La masa del paracaidista es 7.14 Kg

8 0
3 years ago
Other questions:
  • Use the drawing tools to form the correct answer on the grid. Graph a linear function with these key features: positive on (-8,
    7·1 answer
  • Which number produces an rational number when added to 0.25
    10·1 answer
  • A new car has a sticker price of $26,450, while the invoice price paid on it was $20,450. What is the percentage markup?
    5·2 answers
  • Factor completely : 6x^2 - 4x - 2
    14·1 answer
  • I have this one question that I don't get it is 16.404 ÷ 6.​
    12·2 answers
  • 30+12=?(5+2)<br> what factor is missing from the equation?
    11·2 answers
  • Find the 7th term of 1, 5/4, 25/16
    10·1 answer
  • Dilation with a scale of 0.75.
    15·2 answers
  • A discount of 16% saved Jackie $38 on office supplies. What was the price of the supplies before the discount.
    11·2 answers
  • Helpppppppppp!!!!!!
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!