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Artist 52 [7]
4 years ago
10

There is one error in one of five blocks of a program. To find the error, we test three randomly selected blocks. Let X be the n

umber of errors in these three blocks. Compute E(X) and Var(X).
Mathematics
1 answer:
Molodets [167]4 years ago
7 0
<span>The probability, or expectation value for X in a block, equals the number of occurrences of X in all the blocks divided by the total number of blocks

</span>

well E(X)=µ and 

Var(X)=E[(X-µ)^2]

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How to solve this please help me 2/3×1/2(3/4÷1 2/5)​
Damm [24]

Answer:

0.624999999(repeating) so i would round it to 0.625 or 0.63 (both work and are rounded, its really up to wherever your teacher wants you to round it to if they want you to round it)

Step-by-step explanation:

2/3 x 1/2 (3/4 ÷ 2/5)=

simplify the parentheses (3/4 ÷ 2/5) to 1.875

2/3 x 1/2 x 1.875=

simplify 2/3 x 1/2 to 0.333333(repeating)

0.3333333333 x 1.875 = 0.6249999999(repeating)

round it to 0.625 or 0.63 (which ever one your teacher wants you to round it to)

3 0
4 years ago
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neonofarm [45]

Answer:33

Step-by-step explanation:

Add all sides

6 0
3 years ago
Find the number if: 5/9 of it is 90 PLEASE EXPLAIN
yawa3891 [41]

Answer:

<h3 /><h3>The number is 162</h3>

Step-by-step explanation:

Let the number be<u> x</u>

5/9 of the number is 90

Which is

5/9 of x = 90

5/9 × x = 90

5/9x = 90

Multiply through by 9

That's

5x = 810

Divide both sides by 5

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Hope this helps you

6 0
3 years ago
In trapezoid PQRS, identify PQ.
larisa86 [58]
The answer will be 35 because it is a proportional side length
3 0
2 years ago
Read 2 more answers
Find the cosine of ∠W.
allochka39001 [22]

Answer:  8/17

Explanation:

We'll need the pythagorean theorem to find the missing side length.

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Now we can compute the cosine ratio.

cos(angle) = adjacent/hypotenuse

cos(W) = VW/UW

cos(W) = 8/17

4 0
2 years ago
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