The four sides of a printed circuit board (PCB) enclosure consist of two pieces selected from a population whose mean length is
30 cm with standard deviation 0.14, and two pieces selected from a population whose mean length is 45 cm with standard deviation 0.31 cm. Assuming the four pieces are chosen independently, the standard deviation of the perimeter is
1 answer:
Answer:
Step-by-step explanation:
let X1,X2 represents the length of two pieces selected from a population
the mean and standaerd deviation for the length of these two pieces X1,X2 is 30 cm and 0.14 cm
let X2,X3 represents the length of two pieces selected from a population
the mean and standaerd deviation for the length of these two pieces X2,X3 is 45 cm and 0.31 cm
To be continued on the attachment:
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Brian has 39 cards and Wesley has 48 cards
Step-by-step explanation:
Let w be the number of cards Wesley has
and
b be the number of cards Brian has
Then
Putting w = 2b-30 in equation 1
Dividing both sides by 3
Putting b=39 in equation 2
Hence,
Brian has 39 cards and Wesley has 48 cards
Keywords: Linear equations, variables
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Answer: you can use Pythagorean theorem
, which formula is , "a" and "b" are the sides, and "c" is the hypotenuse (the longest side, the side opposite to the 90 degree angle)
<em>Example:</em>
If they give that one side is 2 inches and the other side is 4 and you need to find the hypotenuse it would be like this:
1) plug the numbers to the formula
2) solve the exponents of the numbers given (not the letter, in this case "c")
16 + 36 =
3) combine like terms (in this case 16 +36)
52 =
4) Finally, Find the square root of "c" to remove its exponent and do the same to the other side, in this case 52)
(square root of 52 rounded to the nearest hundred is 7.21)
7.21 = c
<h3><u><em>So 7.21 is your missing side in this example</em></u></h3><h3>look up Pythagorean theorem Khan Academy</h3>