Suppose the joint PMF of the random variables X and Y is P(X= x, Y = y) = a(x+y) 0 1. Find the value of a. 2. Find the value of the covariance Cov(X, Y). (a, Cov(X, Y)) = 1/63,-4/441 if(x, y) = {4,5,6} x {1,2,3}, Otherwise.

Q: I see how you derived at 23.5 but not sure how you got to the final answer of 73.83?

A: The surface area of the composite figure is,

Q: Kim's train arrived at 1:30 after a 2- hour and 45-minute trip. What time did Kim's train start out?…

A: Please refer the attached image for complete solution.

Q: 1 4/5 plus (-3 4/10)

A: 145=1(5)+45=95-3410=-3(10)+410=-3410=-175

Q: why do we round 12.33 up? Shouldn't it be 12?

A: Solution

Q: What is the decimal of 13/7?

A: To Find: Decimal of 13/7   that means we have to divide 13 by 7

Q: Hi, where is the 2.66 coming from?

A:

Q: There are two questions (in image), you worked on question 1. So, you said x=-1336 but also you had…

A: MATRIX : A set of numbers arranged in rows and columns so as to form a rectangular array. The…

Q: What is the result of 2.58×0.12, including correct significant figures?

A: Given, 0.58*0.12

Q: Where did you get the 9.408 from? Is it not supposed to be 0.408

A: Yes it is wrong calculation there supposed to be 0.408 instead of 9.408  i am solving it correctly…

Q: Can you explain how 0.1003 was obtained? because I do not understand how to locate 0.10 on the table

A: Given that, μ=19 daysσ=1 days The 10th percentile for incubation times is,

Q: Out of curiosity, how did you get (1/4)*A instead of 1/(4A)?

A:

Q: What is 12 less than 32 more of both answers sum using a base of 15?

A:

Q: how did you get 10.02  if you do 2.41*1.8+5.7=10.038

A: As we know z-value formula  z=x-μσ now we have : z=2.4μ=5.7σ=1.8

Q: what is the precision of 0.008?

A: The given number is .The aim is to find the precision of the number.

Q: is it 44.356 or 44.346? It says two different things for the solution.

A: It is t=44.346

Q: what is the name of a test that is used to find the power of n=2?

A: Student's t-test is used to determine the mean difference between two treatments that have different…

Q: why did you mulitple 8.2 with 27? where did 27 come from?

A: why did you multiply 8.2 with 27? where did 27 come from?

Q: What is wrong with the following: 4+(10/5)=6-2

A: Given  4 + 10/5 = 6-2

Q: What is the sum if −79.9is added to the difference of 45.9 and 7?

A: The difference of45.9  and 7 is (45.9-7)=38.9

Q: Where does the 0.025 come from?

A: The given confidence level is 95%.

Q: how did you get 123:2 from 0.984/0.016

A: Given that  0.984/0.016

Q: Which expression is equivalent to (0.94)2?

A: (0.94)2 = (0.9)4x2 = 0.98 = 0.43046721

Q: Dina knows that 3 1/8.  She concludes that it must also follow that 0.3 > 0.8. How do you help her…

A: Dina knows that 3<8 Now we try to divide both 3 and 8 into 10 parts.

Q: What is 2/3 as a decimal number, rounded to two decimal places?

A: Two decimal places means there should be 2 numbers behind the point If the third decimal place is…

Q: I am confused on the last 2 steps. Where does the 0.7257 come from?

A: Answer  Given  Mean =88 Standard deviation =5

Q: What is closest to 9.2

A:

Q: So what is the answer rounded to three decimal place

A: The hypothesized mean is 2.85.

Q: How would you answer -12/21+(-10/3)=

A: Here we simplify :-  -1221+-103

Q: Where did they get 45 from out of AC equaling 2025??

A:

Q: How do you round -9.9992 to two decimal points?

A: -9.9992

Q: Evaluate (",) for n = 48.

A: Combination formula : nCr = n!/(n-r)!r!

Q: How

A: