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
slega [8]
2 years ago
11

A project is graded on a scale of 1 to 5. If the random variable, X, is the project grade, what is the mean of the probability

Mathematics
1 answer:
kirza4 [7]2 years ago
7 0

Complete question:

A project is graded on a scale of 1 to 5. If the random variable, X, is the project grade, what is the mean of the probability

distribution below?

Grade(X)_____ 1_____2_____3_____4_____5

Frequency____3 _____5____ 9 ____ 5 ____ 3

P(X) : _______ 0.1 ___0.2 ___0.4 ___ 0.2 __0.1

Answer:

3

Step-by-step explanation:

Given the probability distribution :

Grade(X)_____ 1_____2_____3_____4_____5

Frequency____3 _____5____ 9 ____ 5 ____ 3

P(X) : _______ 0.1 ___0.2 ___0.4 ___ 0.2 __0.1

The mean of the distribution :

Σ(X * P(X)) :

(1*0. 1) + (2 * 0.2) + (3 * 0.4) + (4 * 0.2) + (5 * 0.1)

0.1 + 0.4 + 1.2 + 0.8 + 0.5

= 3

You might be interested in
A student concluded that the solution to the equation sqrt2x+1 +3=0 is x=4. Do you agree? Why or why not?
Katyanochek1 [597]

Just put 4 as x in the equation and solve it. The new equation is:

sqrt(2*4)+1+3 = 0

Now we can solve it.

sqrt(2*4) becomes sqrt8:

sqrt8+1+3=0. -------> sqrt8+4=0

The sqrt of 8 is about 2.83.. so 2.83+4 is:

6.83

So we have 6.83 as the answer

but 6.83 does not equal 0 so x cannot equal 4

5 0
2 years ago
Help I will be marking brainliest!!!
baherus [9]

Answer:

Angle k is 34.5 degrees

Step-by-step explanation:

a circle makes 360 degrees total.  okay so u have to consider the angles given. m arc go= 127

m<0 = 54.5

54.5 times 2 = 109

109 is arc gk

109 + 127+ 55= 291

360-291=69= arc OU

69 divided by 2 is 34.5

Angle k is 34.5 degrees

3 0
3 years ago
38b/-19<br><br> please help me
Natasha2012 [34]
You didn't write what to do with the fraction but I think you meant to ask to simplify it:
38b/-19
Multiply - 19 from top and bottom :
-2b
7 0
3 years ago
The first four terms of a sequence are shown below: 9, 5, 1, â’3 Which of the following functions best defines this sequence? f(
matrenka [14]

The function that best defines this arithmetic sequence is:

  • f(n) = f(n - 1) - 4, f(1) = 9

<h3>What is an arithmetic sequence?</h3>
  • In an <em>arithmetic sequence,</em> the <u>difference between consecutive terms is always the same</u>, called common difference d.

The recursive function that defines the sequence is:

f(n) = f(n - 1) + d

f(1) = f_0

  • In which f_0 is the first term.

In this problem, the sequence is: {9, 5, 1, -3}

  • Each term is the previous term subtracted by 4, hence d = -4.
  • The first term is 9, hence f_0 = 9.

Hence, the function is:

  • f(n) = f(n - 1) - 4, f(1) = 9

You can learn more about arithmetic sequences at brainly.com/question/6561461

5 0
2 years ago
Read 2 more answers
if each interior angle of a regular polygon measures 144 degrees, how many sides does the polygon have?
Lubov Fominskaja [6]
10 sides 180(10-2) 1800-360=1440/10 = 144
3 0
3 years ago
Other questions:
  • A sample of size 40 is taken from an infinite population whose mean and standard deviation are 68 and 12 respectively. the proba
    15·1 answer
  • Point M is the midpoint of segment AB. If AM = 50 – 3x and MB = –20 + 4x, find the value of x. x = -10 x = 10 x = -20 x = 20
    12·1 answer
  • Prove that the product of any three consecutive numbers is even.
    9·1 answer
  • This graph shows the amount of charge left on my computer, c, after I have been awake for h hours.
    6·1 answer
  • A law firm ordered 90 boxes of paper clips. There were 80 paper clips in each box. How many
    14·2 answers
  • Here is the proof of sinx+cos^2x/cosx=tanx+cosx. What is the missing line?
    11·1 answer
  • What is the surface area of the solid that this net can form?
    9·1 answer
  • What is 2+2+2+2.027253
    5·2 answers
  • Traci is running a trail in Hanna Park. She can run one mile in ten minutes. Yoni is running the same trail as Traci. Yoni can r
    7·1 answer
  • The square root of a whole number is between 600 and 700. The whole number must be between:
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!