![subject](/tpl/images/cats/mat.png)
Mathematics, 26.03.2020 22:22 20heldmadison
Let X and Y be the number of hours that a randomly selected person watches movies and sporting events, respectively, during a three-month period. The following information is known about X and Y: \quad{}\quad{}\begin{array}{rcl} E(X) & = & 50\\E(Y) & = & 20 \\ Var(X) & = & 50 \\ Var(Y) & = & 30 \\ Cov(X, Y) & = & 10 One hundred people are randomly selected and observed for these three months. Let T be the total number of hours that these one hundred people watch movies or sporting events during this three-month period. Approximate the value of P(T<7100).
![ansver](/tpl/images/cats/User.png)
Answers: 2
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Mathematics
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 17:00
If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other
Answers: 2
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 17:00
Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.
Answers: 1
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 18:40
Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?
Answers: 1
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 19:00
The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?
Answers: 1
You know the right answer?
Let X and Y be the number of hours that a randomly selected person watches movies and sporting event...
Questions
![question](/tpl/images/cats/mkx.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 20.05.2021 03:00
![question](/tpl/images/cats/himiya.png)
Chemistry, 20.05.2021 03:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 20.05.2021 03:00
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/geografiya.png)
![question](/tpl/images/cats/mkx.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 20.05.2021 03:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mkx.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/himiya.png)
Chemistry, 20.05.2021 03:00
![question](/tpl/images/cats/mat.png)
Mathematics, 20.05.2021 03:00
![question](/tpl/images/cats/es.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 20.05.2021 03:00
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 20.05.2021 03:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 20.05.2021 03:00