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Alexus [3.1K]
2 years ago
8

Find the inverse matrix or type

Mathematics
1 answer:
Nataly [62]2 years ago
5 0

Answer:

I don't know if you mean [3,-1] & [-5,3] or \left[\begin{array}{ccc}3&-1\\-5&3\end{array}\right]

The inverse for first ones are "none" because they're not square matrices.

However the inverse for \left[\begin{array}{ccc}3&-1\\-5&3\end{array}\right]  is  \left[\begin{array}{ccc}0.75&0.25\\1.25&0.75\end{array}\right].

Hope this helps.

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Step-by-step explanation:

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Solve each system of equation algebraically<br> y=x+2<br> y=-3x
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A normal population has a mean of 55 and a standard deviation of 14. You select a random sample of 25. Compute the probability t
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Answer:

(1) The probability that the sample mean  is  Greater than 59 = 0.778

(2) The probability that the sample mean  is  less than 59 = .3632

(3) The probability that the sample mean  is  is Between 54 and 59 = 0.559

Step-by-step explanation:

Given -

Mean (\nu  ) = 55

Standard deviation (\sigma  ) = 14

Sample size ( n ) = 25

the probability that the sample mean (\overline{X})  is  Greater than 59 =

P(\overline{X} >  59 )   =  P(\frac{\overline{X} - \nu}{\frac{\sigma}{\sqrt{n}}} > \frac{59 - 55 }{\frac{14}{\sqrt{25}}})

                 =  P(Z >  1.428 )

                  = 1 - P(Z <  1.428 )

                  =  1 - 0.9222 = .0778

the probability that the sample mean (\overline{X}) is  Less than 54 =

P(\overline{X}<  54 )   = P(\frac{\overline{X} - \nu}{\frac{\sigma}{\sqrt{n}}} <  \frac{54 - 55 }{\frac{14}{\sqrt{25}}})

                    = P(Z< -.357 )

                    =  .3632

the probability that the sample mean is Between 54 and 59 =

P(54< \overline{X}< 59) = P(\frac{54 - 55 }{\frac{14}{\sqrt{25}}}< \frac{\overline{X} - \nu}{\frac{\sigma}{\sqrt{n}}} <  \frac{59 - 55 }{\frac{14}{\sqrt{25}}})

                         = P(-.357< Z< 1.428)

                          = P(Z< 1.428  ) - P(< -.357)

                          = .9222 - .3632

                           = 0.559

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3 years ago
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Answer:

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Step-by-step explanation:

He has 2 points left because he had 52 and then lost 50 meaning subtraction and when you do that you get 2 points. Hope This Helps.

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