The following table shows the probability distribution for a discrete random
1 answer:
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Answer:
42 units^2
Step-by-step explanation:
See diagram below
triangle on top 1/2 base * height = 1/2 * 7 x 2 = 7 units^2
triangle on bottom = 1/2 base * height = 1/2 7 x 2 = 7
rectangle in the middle = 7x4 = 28
total = 7 + 7 + 28 = 42 units^2
Say that the two digit number you have is xy, which is really 10x+y (making it a two-digit number). Based from the first fact, you have the equation 
. The second fact gives you the equation 
. This is now a systems of equations. In order to make it a single-variable equation, multiple the by 3, so it will now look like 
and move around the variables to match the second equation. It will ultimately look like 
. Now subtract both equations from each other and you should be left with 
. Divide both sides by 5 and you now know that 
. Plug the y-value that found back into the equation and solve. If , then 
. So the number was 95.