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3 years ago

5

Please simplify picture attached

2 answers:

umka21 [38]3 years ago

6 0

Answer:

A

Step-by-step explanation:

The answer is A because...

Step one wen need to multiply the conjugate. So we should have 2 square root of 3 square root of 5/ 3 square root of 5 square root of 5
Step two-Then we solve the numerator. 2 square root 3 square root 5= 2 square root 15
Step three- Now we solve the denominator 3 square root 5 square root 5 which equals 15
Finally we place the numerator over the denominator to get 2 square root
It will be easier to understand if you see it in picture so I typed it up for you
Hope this helped

Mekhanik [1.2K]3 years ago

3 0

Answer:

It is the first bubble.

Step-by-step explanation:

multiply the fraction $\frac{\sqrt{5} }{\sqrt{} 5}$

multiply the numerators and denominators seperatly

calculate the product

multiply the numbers

solution

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Answer:

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$c =\frac{1}{12}$

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And replacing we got:

$E(Y) = \frac{1}{12} (1^2 + 2^2 + 4^2 +5^2) = \frac{46}{12}= \frac{23}{6}$

Step-by-step explanation:

For this case we know the following probability mass function given:

$P(y) = cy , y= 1,2,4,5$

For this case we need to satisfy the following condition in order to have a probability distribution function:

$\sum_{i=1}^n P(y_i) =1$

And we have this:

$c(1+2+4+5) =1$

$c =\frac{1}{12}$

Now we can find the expected value with this formula:

$E(Y) =\sum_{i=1}^n Y_i P(Y_i) =\sum_{i=1}^n cy_i *y_i = cy^2_i$

And replacing we got:

$E(Y) = \frac{1}{12} (1^2 + 2^2 + 4^2 +5^2) = \frac{46}{12}= \frac{23}{6}$

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3 years ago