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lara31 [8.8K]
2 years ago
14

Read this E[2X^2 â€" Y].

Mathematics
1 answer:
djyliett [7]2 years ago
6 0

Looks like a badly encoded/decoded symbol. It's supposed to be a minus sign, so you're asked to find the expectation of 2<em>X </em>² - <em>Y</em>.

If you don't know how <em>X</em> or <em>Y</em> are distributed, but you know E[<em>X</em> ²] and E[<em>Y</em>], then it's as simple as distributing the expectation over the sum:

E[2<em>X </em>² - <em>Y</em>] = 2 E[<em>X </em>²] - E[<em>Y</em>]

Or, if you're given the expectation and variance of <em>X</em>, you have

Var[<em>X</em>] = E[<em>X</em> ²] - E[<em>X</em>]²

→   E[2<em>X </em>² - <em>Y</em>] = 2 (Var[<em>X</em>] + E[<em>X</em>]²) - E[<em>Y</em>]

Otherwise, you may be given the density function, or joint density, in which case you can determine the expectations by computing an integral or sum.

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A rectangle and a triangle have the same area.
Andrej [43]
<h3>Answer:</h3>

<u>If a rectangle and a triangle have the same area</u>.

Then,

  • <u>L × B = 1/2 × B × H</u>
  • 10 × 3 = 1/2 × 6 × H
  • 30 = 3 × H
  • 30/3 = H
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<u>Hence, the height of triangle is 10cm</u>.

7 0
2 years ago
Jim drove 605 miles in 11 hours. At the same rate, how many miles would he drive in 13 hours?
svlad2 [7]

Answer: 715 Miles


Step-by-step explanation:

Divide 605 miles by 11 hours, which would give you how far he travels in 1 hour. (605/11=55)  Since they give you 13 hours, multiply 13 hours by 55 miles which gets you 715 miles :)

8 0
3 years ago
At Grab &amp; Go Grocery, you can buy 4 yogurt cups for $5. If the unit price stays the same, how much would it cost to buy 10 y
Oduvanchick [21]

Answer:

12.50

Step-by-step explanation:

Each yogurt is $1.25. 1.25 x 4 = 5. so 1.25 x 10 = 12.50.

5 0
2 years ago
2) (-8, -9). (4.-10)
const2013 [10]

Answer: √

145 or 12.04159457 for the decimal ways try 12

Step-by-step explanation: 12.0415945787923

Midpoint (−2,−9.5)

Slope −0.0833333333333333

x intercept −116.00

y intercept −9.67

4 0
3 years ago
Read 2 more answers
Can some one help me factor 6x^2+4x-10
Fudgin [204]
2(3x + 5) (x - 1)

This is done through factoring 2 out of the equation first...

2(3x^2 + 2x -5)

And then cross multiplying it
3 0
3 years ago
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