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
zloy xaker [14]
3 years ago
11

On a quiz there are four multiple-choice questions worth 3 points each and two true/false questions

Mathematics
2 answers:
vazorg [7]3 years ago
7 0

Answer:

C. 3.4

Step-by-step explanation:

P(correct MCQ) = ⅕

P(correct T/F) = ½

4×3×⅕ + 2×1×½

2.4 + 1

3.4

Free_Kalibri [48]3 years ago
4 0

Answer:

C. 3.4

Step-by-step explanation:

We need to find expected value, which is essentially the value that we expect to get based on the amount of each "thing" at hand.

Here, we have 4 multiple-choice questions worth 3 points each and 2 true/false questions worth 1 point each. Each multiple-choice question has 5 possible answers, so the probability that you get that multiple-choice question correct is 1/5. Similarly, each true/false question has 2 possible answers, so the probability that you get that question right is 1/2.

Expected value, denoted by E(x), has the formula:

E(x) = ∑ xp(x), where x is the number of points you get per problem here and p(x) is the probability of getting the problem correct

E(x) = 4 * 3 * (1/5) + 2 * 1 * (1/2) = 12/5 + 1 = 17/5 = 3.4.

The answer is thus C.

You might be interested in
The equation of a line is -6x - 2y = -18. What is the x-intercept & y-intercept of the line?
WARRIOR [948]

Answer: y int: (0,9)    x int: (3,0)

Step-by-step explanation:

In slope intercept form, the equation is y=-3x+9. In the formula y=mx+b, we know b is the y intercept, so our y int. is 9. To find our x intercept, we set y=0. So, 0=-3x+9=>3x=9=>x=3

5 0
3 years ago
Tina’s little brother had 25 liters of water in his wading pool and splashed 1/5 of the water out. Tina then added 7 liters of w
Shkiper50 [21]

Amount of water after splash = 25(4/5) = 20L

Amount of water after Tina adds water = 20L + 7L = 27L

7 0
3 years ago
Read 2 more answers
What is the area of the shape below.
Alex787 [66]

For a trapezoid, the area is:

S=(b+B)h/2, where b and B are the bases, and h is the height.

b=2

B=2+2+2=6

h=2.

S=(2+6)×2/2=8

5 0
3 years ago
Read 2 more answers
Which of the following statements does not describe a characteristic of the line of best fit for a scatter plot?
stira [4]

A statement which does not describe a characteristic of the line of best fit for a scatter plot is that: A. the line of best fit should be the average of all the data points.

<h3>What is a scatter plot?</h3>

A scatter plot can be defined as a type of graph which is used for the graphical representation of the values of two variables, with the resulting points showing any association (correlation) between the data set.

<h3>What is a line of best fit?</h3>

A line of best fit is also referred to as a trend line and it can be defined as a statistical (analytical) tool that is used in conjunction with a scatter plot, in order to determine whether or not there's any correlation between a data.

<h3>The characteristics of a line of best fit.</h3>

The statements which describe a characteristic of the line of best fit for a scatter plot include the following:

  • The line should be as close to the points as possible.
  • The number of points above the line should be equal to the number of points below the line.
  • The distance between the points above the line and the line should be relatively equal to the distance between the points below the line and the line.

Read more on scatterplot here: brainly.com/question/6592115

#SPJ1

7 0
1 year ago
Please solve<br><br> ??-3/10=1/5
lina2011 [118]

Answer:

5

Step-by-step explanation:

5-3=2

2/10=1/5

6 0
2 years ago
Read 2 more answers
Other questions:
  • 20 gallons is about how many liters?
    14·2 answers
  • God Bless u plz help plz bless ur grades
    14·1 answer
  • I am having trouble graphing exponential functions. Can someone help me.
    5·1 answer
  • What is the missing number?
    8·2 answers
  • What is the final step in solving the inequality –2(5 – 4x) &lt; 6x – 4? x &lt; –3 x &gt; –3 x &lt; 3 x &gt; 3
    9·1 answer
  • Divide<br> (-x* + 2x’ +3x– 5x – 2)/(x² – 2x+1)
    11·1 answer
  • How many time does 3 go into 20?
    13·2 answers
  • Evaluatef(x) = 2.5x-11 when x = 4
    10·1 answer
  • What the answer of this question?
    10·2 answers
  • Is y5 -25 difference of squares
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!