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statistics – expected value in a linear combination

I have a random variable Y, which is defined by:

$$ Y = aX_1 + bX_2 $$

Where we know $ X_1 $ Y $ X_2 $ They are independent. How do I write? $ EX_1 $ Y $ EX_2 $ in terms of only a, second, EY, and VarY?

I have already written the expectation of Y to the following expectation properties:

$$ EY = aEX_1 + bEX_2 $$

and to obtain $ EX_1 $ I can write $ frac {EY = bEX_2} {a} $ ; however, how would I get rid of the $ EX_2 $ ? Essentially, I can write the expectations of the linear combinations, but I have no idea how to write each individual expectation within that linear combination without using the other variables in that combination.

Finally, how could you solve the expectation of $ X_i $ for a general form $ Y = a_1X_1 + ... + a_iX_i $ only in terms of $ a_ {1, ..., i} $ , EY, and VarY?

Thank you!

PS This is my first Stack post, and I was wondering how to get everything to appear in Latex.

dragon age rpg – How can I calculate the expected number of attack points per attack?

If I hit a 3, the Dragon Dice can show anything, so on average it is 3.5 attack points per attack.

If I hit only 18, the Dragon Dice can only show 6. If I multiply it with the hit probability (1/216) it's 0.277 Stunt Point per attack.

How can I calculate the intermediate parts?

Rewrite: Nginx root does not work as expected

I'm trying to achieve the following:

The root of my domain. http: //www.paulix.local/ must server the file located in /var/www/html/main/webroot/index.php

The url http: //www.paulix.local/malibumust serve the file located in /var/www/domain/malibu/webroot/index.php

This is my current configuration

server {
listen 80;
listen out [::]: 80;

rewrite_log in;
access_log /var/log/nginx/paulix-access.log;
error_log /var/log/nginx/paulix-errors.log warning;

server name www.paulix.local;
root / var / www / html / main / webroot;
Index index.php;

# location 1
Location / {
try_files $ uri $ uri / /index.php?$args;
}

# location 2
location ~ / malibu {
root / var / www / domain / malibu / webroot;
try_files $ uri $ uri / /index.php?$args;

# location 3
location ~  .php $ {
returns 200 "Malibu is $ document_root $ fastcgi_script_name";
}
}

# location 4
location ~  .php $ {
returns 200 "Global $ document_root $ fastcgi_script_name";
}
}

If I hit the url http: //www.paulix.local, arrives at location 4 and I get the next exit: /Var/www/html/main/webroot/index.php global which is what I'm waiting for

PROBLEMS

If I hit the url http: //www.paulix.local/malibu it also arrives at location 4 with the same exit as before, but expected it to arrive at location 3, the expected exit is: Malibu is /var/www/domain/malibu/webroot/index.php

Lastly, hitting http: //www.paulix.local/malibu/index.php arrives at location 3, but not with the expected departure. It gives out Malibu is /var/www/domain/malibu/webroot/malibu/index.php when I would like it to be /var/www/domain/malibu/webroot/index.php

Is it expected to improve the speed from the rooting / modification of a Samsung Galaxy Player 4.2 YP-GI1?

I have an old Samsung Galaxy Player 4.2 YP-GI1 out there and I would like to use it as a multimedia player or as a remote control of the multimedia center. However, even after a factory reset, the device or user interface reacts like a bullet. There are some bloatware on it, some of which apparently can not be disabled.
Will the rooting and launching of something similar to the Ethereal ROM considerably improve (as indicated here: https://forum.xda-developers.com/showthread.php?t=1720457)

I ask because I tried SuperOneClick and it does not work. I guess it's not worth the time and effort if I can not expect better performance. What are your thoughts?

MISS expected in the first page load after the product price update

After sending the Magento 2.X extension for technical review, the installation and varnish test are failing

Results of the installation and varnish tests.

Below is the screenshot for the error

What to do to fix this error?

Python 3.x – What is the problem in this code, does not execute as expected?

The question was …
Returns a sentence with inverted words
master_yoda (& # 39; I'm home & # 39;) -> & # 39; I'm home & # 39;
Eventually it will revert the words of the line.

I am learning and running python in Jupyter Notebook

def master_yoda (string):
l = string.split () “
p = len (string) – 1
final = & # 39; & # 39;
while p <0:
final = final + & # 39; & # 39; + s[p]
p = p-1
print (final)
master_yoda (& # 39; Hello my name is Aryan & # 39;)

The exit is nothing ..
There are no syntax errors, but there is no output yet …

linux – Errors during the construction of QEMU: expected & # 39;) & # 39;

I am trying to build Qemu 4.0 (I also tried 3.1.0 which resulted in the same behavior) on an Ubuntu 18.04 machine. All the necessary dependencies must be installed and I simply follow the instructions on the Qemu website, being:

1) Download
2) Unpack
3) ./configure
4) make -j

The configuration step works without problems, however, the real brand is running into problems. I am receiving the following errors:

qga / main.c: In the function & # 39; init_dfl_pathnames & # 39 ;:
qga / main.c: 128: 30: error: expected & # 39; & # 39; & # 39; & # 39; before & # 39; G_DIR_SEPARATOR_S & # 39;
QGA_STATE_RELATIVE_DIR G_DIR_SEPARATOR_S "qemu-ga.pid");
^ ~~~~~~~~~~~~~~~~
qga / main.c: In the function & # 39; config_load & # 39;
qga / main.c: 61: 46: error: expected, & # 39; or & # 39 ;; & # 39; & # 39; before & # 39; G_DIR_SEPARATOR_S & # 39;
#define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
^
qga / main.c: 970: 48: note: in the expansion of the macro 'QGA_CONF_DEFAULT'
const char * conf = g_getenv ("QGA_CONF") ?: QGA_CONF_DEFAULT;
^ ~~~~~~~~~~~~~~~
In the included file of /usr/include/glib-2.0/glib.h:62:04,
from /home/user/qemu/qemu-3.0.1/include/glib-compat.h:32,
from /home/user/qemu/qemu-3.0.1/include/qemu/osdep.h:122,
from qga / main.c: 14:
qga / main.c: 61: 46: error: it was expected & # 39;) 'before & # 39; G_DIR_SEPARATOR_S & # 39;
#define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
^
/usr/include/glib-2.0/glib/gmessages.h:336:32: note: in the macro definition & # 39; g_critical & # 39;
__VA_ARGS__)
^ ~~~~~~~~~~
qga / main.c: 1025: 20: note: in the expansion of the macro 'QGA_CONF_DEFAULT'
QGA_CONF_DEFAULT, gerr-> message);
^ ~~~~~~~~~~~~~~~
qga / main.c: 1024: 20: warning: the '% s' format expects a matching 'char *' argument [-Wformat=]
         g_critical ("error loading the configuration from the route:% s,% s",
^
/usr/include/glib-2.0/glib/gmessages.h:336:32: note: in the macro definition & # 39; g_critical & # 39;
__VA_ARGS__)
^ ~~~~~~~~~~
/home/user/qemu/qemu-3.0.1/rules.mak:69: the recipe for the goal & # 39; qga / main.o & # 39; failure
do: *** [qga/main.o] Error 1

I'm not sure how I can deal with the "missing" & # 39; s errors. " Checking the code everything seems fine. Does anybody have an idea?

Keyboard: when the application is changed, the selected Chrome window is not expected.

Configuration:

Chrome is open with multiple windows on different desktops
The mission control is configured so that the monitors have separate desks

When you use Alt + Tab to switch between applications to Chrome (from another application), the Chrome window selected automatically is not always the last one that was focused. Sometimes select a Chrome window on a different desktop.

Is there any way to make sure that the window that is focused is the last window that was focused on using Chrome before moving away from it?

I have had this problem through multiple versions of Mac OS X.

Probability: conditional expected value and variance of the average preservation propagation

My first post here, and my math skills are more than a little rusty. I have a simple question for you: suppose that Y is an average spread of X.

Is it always true that: E (X | X> Y) <E (Y | Y <X)? How to prove it?

Is it also true that, for some value of C> 0, Var (Y | Y> C) < Var(X|X>DO)?

Thank you very much in advance!