3 years ago

Can anyone explain how to do this???

Mathematics

1 answer:

Gwar [14]3 years ago

3 0

Answer:

(x−1)(x−2)(−3x+1)

=((x−1)(x−2))(−3x+1)

=((x−1)(x−2))(−3x)+((x−1)(x−2))(1)

=−3x3+9x2−6x+x2−3x+2

=−3x3+10x2−9x+2

Step-by-step explanation:

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Gala2k [10]

Answer:

The probability that their mean life will be longer than 13 years = .9943 or 99.43%

Step-by-step explanation:

Given -

Mean $(\nu )$ = 15 years

Standard deviation $(\sigma )$ = 3.7 years

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$P(\overline{X}> 13)$ = $P(\frac{\overline{X} - \nu }{\frac{\sigma }{\sqrt{n}}}> \frac{13 - 15 }{\frac{3.7}{\sqrt{22}}})$ $(Z =\frac{\overline{X} - \nu }{\frac{\sigma }{\sqrt{n}}})$

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