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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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Find the next two terms in the sequence.
Margaret [11]
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Third  one is D

Second question:

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5 0
3 years ago
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A campus radio station surveyed 500 students to determine the types of music they like. The survey revealed that 192 like rock,1
mihalych1998 [28]

Answer:

160

Step-by-step explanation:

Total students were 500.

We define our grupes:

Rock = A

country = B

Jazz = C

The groups are given by,

A=192

B=156

C=118

From the combination we have:

A \cap B=18

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8 0
3 years ago
Consider the following simplified algebraic expression. Which could be the original expression?
dem82 [27]

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8x²y + 7x² - 5y² + 3x - 2 + 2x²y - x² -  2y² + 3x - 4

To make it easier, arrange the values around so that similar ones are beside each other:

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then add the similar values together:

8x²y + 2x²y = 10x²y

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and if you put them together:

10x²y + 6x² - 7y² + 6x - 6

This isn't the answer to the equation, because it's different. So repeat the process with all the other equations until you find one that is identical to the simplified version.

The answer is the second one: 8x²y + 7x² - 5y² + 3x - 2 + 2x²y - x² -  2y² - 3x - 4

6 0
3 years ago
Read 2 more answers
Can you please help with both? :)​
Serjik [45]

Answer:

12, 20

Step-by-step explanation:

Don't worry I just know

8 0
3 years ago
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NemiM [27]
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6 0
3 years ago
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