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3 years ago

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In the designation of wrought Al alloys, eg. 3m, what does the first digit-3- refer to? A. The main alloying element B. Carbon p

ercentage of the alloy C. Whether it is an ingot or a billet D. Specific alloy heat treatment

1 answer:

andrew-mc [135]3 years ago

7 0

The first digit in the designation for wrought Al is the principal alloying element.

The answer is A.

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3 years ago

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For this case we can define the random variable X as "hours that a person watches television". For this case we don't have the distribution for X but we have the following parameters:

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And we want to find this probability:

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And we can use the z score formula given by:

$z=\frac[X- \mu}{\sigma}$

And we can find the z score for each limit and we got:

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And we can find this probability with this difference:

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3 years ago