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siniylev [52]
3 years ago
10

Assume that you assign the following subjective probabilities for your final grade in your econometrics course (the standard GPA

scale of 4-A to 0-F applies): Probability 0.20 0.50 0.20 0.08 0.02 Grade The expected value is_____________.A. 3.5 B. 3.25. C. 2.78.D. 3.0
Mathematics
1 answer:
rodikova [14]3 years ago
3 0

Answer:

E(X) = 4*0.2 +3*0.5+ 2*0.2 +1*0.8+ 0*0.02= 2.78

So then the best answer for this case would be:

C. 2.78

Step-by-step explanation:

For this case we have the following probabability distribution function given:

Score         P(X)

A= 4.0       0.2

B= 3.0       0.5

C= 2.0       0.2

D= 1.0        0.08

F= 0.0       0.02

______________

Total          1.00

The expected value of a random variable X is the n-th moment about zero of a probability density function f(x) if X is continuous, or the weighted average for a discrete probability distribution, if X is discrete.

If we use the definition of expected value given by:

E(X) = \sum_{i=1}^n X_i P(X_I)

And if we replace the values that we have we got:

E(X) = 4*0.2 +3*0.5+ 2*0.2 +1*0.8+ 0*0.02= 2.78

So then the best answer for this case would be:

C. 2.78

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Vsevolod [243]

Answer:

1.

x <   -  \frac{5}{13}

2.

x \geqslant  -  \frac{1}{5}

Step-by-step explanation:

↷

- \frac{13}{16}x +  \frac{3}{8}  <  \frac{11}{16}  \\  \frac{  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  - \frac{3}{8 }    <   -   \frac{3}{8} }{ \frac{  -  \frac{13}{16}x }{   - \frac{13}{16} }   <   \:  \:  \:  \frac{ \frac { 5}{16} }{ -  \frac{ 13}{16} } }   \\  \\ x  <    \frac{ - 5}{ \: 13}

↷

\frac{1}{3}  \geqslant  \frac{2}{9}  -  \frac{5}{9} x \\  \frac{   -  \frac{  2}{9} \geqslant   -   \frac{2}{9} \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:   }{ \frac{ \:  \:  \:  \frac{1}{9}x }{  - \frac{ 5}{9} } \geqslant   \frac{  - \frac{5}{9} }{  - \frac{5}{9} }   }  \\  \\ x  \geqslant   -  \frac{1}{5}

6 0
3 years ago
448 = -5v + 8(-5 - 7v)<br> What is v?
lapo4ka [179]

Answer:

v = -8

Step-by-step explanation:

First we would have to distribute the 8(-5 - 7v). To do this we would multiply 8 by -5 and 8 by -7v to get 448=-5v-40-56v. After this, we would have to simplify like terms by subtracting 56v from -5v to get 448=-61v-40. We now have to get the variable on one side and to do that, we can add 40 to both sides to get 488=-61v. Finally to get the variable alone, we would have to divide both sides by -61 to get v=-8.

Brainliest would be appreciated!

3 0
2 years ago
Read 2 more answers
2. El
Mashcka [7]

Answer:

95

Step-by-step explanation:

step 1

Find out the total ball bearing ordered

Multiply the number of ball bearing boxes by the number of ball bearings in each box.

17(85)=1,445\ ball\ bearings

step 2

Find out the total springs ordered

Multiply the number of spring boxes by the number of springs in each box.

15(90)=1,350\ springs

step 3

To find out how many more ball bearings than  springs did they order, subtract the total number of springs from the total number of ball bearings

1,445-1,350=95

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3 years ago
The decimal number 0.2 5 is an example of a terminating decimal.<br><br> true false PLEASE ANSWER
frozen [14]

Answer:

true

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Evaluate.
tekilochka [14]

Step-by-step explanation:

W=-6, x=1.2, and z=-6/7

(W²x-3)÷10-z

we substitute

((-6²)(1.2)-3)÷10-(-6/7)

((-36)(1.2)-3) ÷10-(-6/7)

(-43.2-3) ÷10(6/7)

(-46.2)÷60/7

-46.2÷60/7

-46.2*7/60

-46.2/1*7/60

-323.4/60

-5.39

8 0
2 years ago
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