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Lady bird [3.3K]
3 years ago
14

[20 POINTS] Can someone help me with question 3 and 4. I’ll mark the correct answer brainliest

Mathematics
1 answer:
Liula [17]3 years ago
8 0
So, for number 3, its 2. and for number 4 its also 2
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Help please!! 15 points!!
dolphi86 [110]
15 points I got you!!!
7 0
3 years ago
Assume that you assign the following subjective probabilities for your final grade in your econometrics course (the standard GPA
rodikova [14]

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

3 0
3 years ago
Joe makes $13.35 an hour. If Joe works 40 hours in one week, how much would he earn for the week?
Lelechka [254]

Answer:

534

Step-by-step explanation:

multiply 13.45 by 40 and you will get 534

6 0
3 years ago
Lesson 10 Unit 4 ablgebra 1 b test awnsers wth questions
Aleks04 [339]

AND?!?

.....................................

7 0
3 years ago
Asssesmenttt lasttt......
ratelena [41]

Answer:

<em>( About ) 1.77 seconds; Option B</em>

Step-by-step explanation:

We are given the equation h ( t ) = - 16t^2 + 50, so in order to determine the time let us determine the x - intercept for y ⇒ 0;

- 16t^2 + 50 = 0,

- 16t^2 = - 50,

t^2 = 25 / 8,

Thus t ⇒ √ ( 25 / 8 ), and t ⇒ - √ ( 25 / 8 ),

t ⇒ ( 5√2 )/ 4, and - ( 5√2 )/ 4,

But time is represented only by a positive value, thus

t ⇒ ( 5√2 )/ 4 = 1.767766953......., ( About ) 1.77 seconds

<em>Answer; ( About ) 1.77 seconds; Option B</em>

7 0
3 years ago
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