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Blizzard [7]
3 years ago
8

What is -2 + 5(9 − 12)

Mathematics
2 answers:
ira [324]3 years ago
7 0

Answer:

-17

Step-by-step explanation:

hope this helps

Alexxx [7]3 years ago
6 0

Answer:

-17

Step-by-step explanation:

-2 + 5(9 − 12)

PEMDAS

Parentheses first

-2 + 5(-3)

Then multiply

-2 -15

Subtract

-17

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62.8

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g A sample of 3 items is chosen at random from a box containing 20 items, out of which 4 are defective. Let X be the number of d
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Answer:

The variance and standard deviation of <em>X</em> are 0.48 and 0.693 respectively.

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Step-by-step explanation:

The variable <em>X</em> is defined as, <em>X</em> = number of defective items in the sample.

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A random sample of <em>n</em> = 3 items are selected at random.

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Compute the standard deviation (σ (X)) as follows:

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Thus, the variance and standard deviation of <em>X</em> are 0.48 and 0.693 respectively.

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Compute the standard deviation of (20 - X) as follows:

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Thus, the variance and standard deviation of (20 - <em>X</em>) are 0.48 and 0.693 respectively.

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