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koban [17]
3 years ago
14

Multiply. −3.6(−5.4)(3)

Mathematics
2 answers:
Ratling [72]3 years ago
7 0

Answer:

-3.6(-5.4)(3)

=58.32

hope it helps.

Fynjy0 [20]3 years ago
5 0

Answer:

it's answer is 58.32

hope it is helpful to you

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Answer:

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Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

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Now, we have to find a value of T, which is found looking at the t table, with 19 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.9}{2} = 0.95. So we have T = 1.7291

The margin of error is:

M = T\frac{s}{\sqrt{n}}

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M = 1.7291\frac{5}{\sqrt{20}}

M = 1.933

The margin of error of the 90% confidence interval of a student's average typing speed is of 1.933 wpm.

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