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Mathematics

2 answers:

drek231 [11]3 years ago

6 0

Answer:

37.9 degrees

Step-by-step explanation:

Using the law of sines, $\frac{\sin(m\angle C)}{21}=\frac{\sin(47^\text{o})}{25}$ . It follows that $\sin (m\angle C) = \frac{21\sin(47^\text{o})}{25} \approx 0.6143371$ . Therefore, $m\angle C = \sin^{-1}(0.6143371)=37.9^\text{o}$ .

Semmy [17]3 years ago

6 0

The answer 39.7. I not all the way sure

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Which critical value is appropriate for a 99% confidence level where nequals17, sigma is unknown, and the population appears

My name is Ann [436]

Answer:

t Subscript alpha divided by 2 = 2.921

Step-by-step explanation:

With sample sizes lower than 30, we use the t-test.

Otherwise, we use the z-test.

Here, n = 17

So we use the t-test.

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

df = 17 - 1 = 16

Now, we have to find a value of T, which is found looking at the t table, with 16 degrees of freedom(y-axis) and a confidence level of 0.99( $t_{1 - (\frac{1-0.99}{2}}) = 0.995$ ). So we have T = 2.921