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vfiekz [6]
3 years ago
12

Let y be a random variable with p(y) given in the accompanying table. find e(y ), e(1/y ), e(y 2 − 1), and v(y ). y 1 2 3 4 p(y)

.4 .3 .2 .1
Mathematics
1 answer:
Studentka2010 [4]3 years ago
8 0
<span>E[Y] = 0.4·1 + 0.3·2 + 0.2·3 + 0.1·4 = 2 E[1/Y] =0.4·1/1 + 0.3·1/2 + 0.2·1/3 + 0.1·1/4 = 0.4 + 0.15 + 0.0666 + 0.025?0.64 V[Y] =E[Y2]-E[Y]2= (0.4)·12+(0.3)·22+(0.2)·32+(0.1)·42-22= 0.4+1.2+1.8+1.6-4= 5-4 = 1</span>
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Dude i might as well give up because no on is gonna answer this on
Schach [20]

Answer: it’s not

Step-by-step explanation:

When you plug the value in, you do not get that answer. All you have to do is plug the value and then solve.

8 0
2 years ago
Ricardo and Brandon ran 1500-meter race. Ricardo finished in 4.89 minutes. Brandon finished in 4.83 minutes. What was the time o
crimeas [40]

Answer:

4.83 minutes

Step-by-step explanation:

The one who took the shortest time ro cover the same distance is regarded as the first runner to complete the race. Since 4.83<4.89 then it means the shortest time is 4.83 minutes. This means that Brandon finished the race first since he took less duration compared to Ricardo. The time for Brandon is given as 4.83 minutes hence this is the duration required in the question.

5 0
3 years ago
Sam started with savings of $2,500 and adds $40 to his savings each week. Marshall started with $7,300 in savings and spends $60
Oliga [24]

The number of weeks it will take both Sam and Marshall to have the same amount of savings in their accounts is 48 weeks

Given:

<em>Amount with Sam </em>= $2,500

<em>Additional savings each week</em> = $40

<em>Amount with Marshal</em> = $7,300

<em>Amount spent each week</em> = $60

let

x = <em>number of weeks</em>

<em>Sam equation:</em>

2500 + 40x

<em>Marshall's equation:</em>

7300 - 60x

Equate both

2500 + 40x = 7300 - 60x

<em>collect like terms</em>

2500 - 7300 = - 60x - 40x

-4800 = -100x

divide both sides by - 100

x = -4800 / -100

x = 48 weeks

Therefore, the number of weeks it will take both Sam and Marshall to have the same amount of savings in their accounts is 48 weeks

Read more:

brainly.com/question/8957185

5 0
2 years ago
Which line shows the first error in the solution?
Taya2010 [7]
The answer is line 3. Line 3 has -12 - 3 and below that they have -9. It would be
-12 - 3 = -15
3 0
3 years ago
What is the area of the shower floor ?
PilotLPTM [1.2K]

Answer:

42 sq feet

Step-by-step explanation:

w = 26 ÷ 2 - 7 = 6 ft

A = lw = 6 × 7 = 42

5 0
3 years ago
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