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4 years ago

12

Sample of 3 items is selected at random from a box containing 20 items of which 4 aredefective. find the expected number of defe

ctive items in the sample.

1 answer:

azamat4 years ago

6 0

That's 54 I think. 20x3=60-4=54

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Which of the following choices simplified the expression:

forsale [732]

<h2>Hello!</h2>

The answer is:

The correct option is the second option:

$\frac{5}{2},\frac{-1}{2}$

<h2>Why?</h2>

We are given the following expression:

$\frac{2+-\sqrt{9}}{2}$

Now, solving we have:

First solution:

$\frac{2+\sqrt{9}}{2}=\frac{2+3}{3}=\frac{5}{2}$

Second solution:

$\frac{2-\sqrt{9}}{2}=\frac{2-3}{3}=\frac{-1}{2}$

Hence, we have that the correct option is the second option:

$\frac{5}{2},\frac{-1}{2}$

Have a nice day!

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3 years ago

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Step-by-step explanation:

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Step-by-step explanation:

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3 years ago

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svet-max [94.6K]

The answer is 25 degrees

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The speed of the international space station is 27,576 kilometres per hour.

Dmitriy789 [7]

(27576km/hr)(24hr/day)(orbits/42600km)=orbits/day=15.53

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3 years ago