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aleksandr82 [10.1K]
3 years ago
7

S.D(X) = 6 and S.D(Y) = 8. If X and Yare independent random variables, then S.D(X-Y) is:

SAT
1 answer:
Mademuasel [1]3 years ago
3 0

Answer:

14

Explanation:

For independent variables X and Y;

S.D(X - Y) is expanded as :

S.D(X) + S.D(Y)

If S.D(X) = 6 and S.D(Y) = 8 ; where, X and Y are independent ;

SD(X-Y) = SD(X) + SD(Y)

SD(X - Y) = 6 + 8

SD(X - Y) = 14

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Which of the following statements is true regarding distribution centers
sammy [17]

Distribution centers enable retailers to carry less merchandise in individual stores.

<h3>What are distribution centers?</h3>

Distribution centers in business also known as warehouses are centers where goods for sale are kept in large quantities for onward distribution to retailers.

Distribution centers are very important to both the producer as well as the retailer.

Distribution centers ensure that the retailers are able to get the goods they sell at a discount price. It also ensures that the retailers do not have seek out the producers in their various factories for them to purchase the goods they need.

Thus, distribution centers enable retailers to carry less merchandise in individual stores.

For the producers, distribution centers serve as an outlet for the producers to get their good into the hands of retailers in large quantities. It also solves the problem of logistics for the producers.

In conclusion, distribution centers serve as temporary stores for goods.

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8 0
2 years ago
a) using your equation from step 2d, estimate the gpa of a student who studies for 15 hours a week. justify your answer.
Pavlova-9 [17]

Using previously given equation, the estimate of the GPA of a student who studies for 15 hours a week is; 3.1

<h3>How to predict an equation?</h3>

The equation here is probably a "best fit" equation based upon given data which is GPA versus the number of hours of study per week.

Now, the equation of best fit is given as;

y = 0.149x + 0.89

Thus, if the number of study hours of interest is 15, then the GPA is;

GPA =  0.149(15) + 0.89

GPA = 3.1

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4 0
2 years ago
An ice skating competition features 8 skaters. How many different ways can the skaters finish the competition? how many differen
yan [13]

The number of ways the skaters can finish the competition is 40,320 ways

The different ways 3 of the skaters finish first, second and third is 56 ways

Given the following

  • Number of skaters featured = 8 skaters

If the skaters finish the competition, the number of different ways the skaters finish the competition is expressed as:

8! = 8*7*6*5*4*3*2

8! = 56*30*24

8! = 40,320.

The number of ways the skaters can finish the competition is 40,320 ways

If 3 of the skaters finish first, second and third, the number of ways this can be done is given as:

8C3 = 8!/(8-3)!3!

8C3 = 8!/5!3!

8C3 = 8*7*6*5!/5!3!

8C3 = 56 ways

Hence the different ways 3 of the skaters finish first, second and third is 56 ways

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8 0
3 years ago
What is the volume of the table tennis ball?
Lera25 [3.4K]

Answer:

V=4 3 πr3 V=4 3 π (3.29cm) 3 V≈149cm3

Explanation:

7 0
3 years ago
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Real estate values change over time. The value of current real estate can determine how much or how little you pay for a home or
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Answer:

True

Explanation:

Because no one ever sells a house for the same price for example no one would sell their house for $100

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