3 years ago

The hour of a clock moves from 10 to 1 o'clock. Through how many degrees does it moves?

1 answer:

4 0

Since each interval of the hours of the clock is 30 degrees, the movement of the hand of the clock from 10 to 1 clockwisely is 90 degrees. the answer is 90 degrees

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2=x

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pshichka [43]

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Lelechka [254]

Answer:

The degrees of freedom for this sample are 27.

The sample size to get a margin of error equal or less than 0.3656 is n=4450.

Step-by-step explanation:

The degrees of freedom for calculating the value of t are:

$df=n-1=28-1=27$

With 27 degrees of freedom and 95% confidence level, from a table we can get that the t-value is t=2.052.

The sample size to get a margin of error equal or less than 0.3656 can be calculated as:

$MOE=t\cdot s/\sqrt{n}\\\\n=\left(\dfrac{t\cdot s}{MOE}\right)^2=\left(\dfrac{2.052\cdot 11.8841}{0.3656}\right)^2=66.7^2\\\\\\n=4449.13\approx4450$

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