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2 years ago

9

Mary was both 13th highest and 13th lowest in a spelling contest. how many people were in the contest?

1 answer:

MariettaO [177]2 years ago

8 0

This is the concept of median of statistical data, given that Mary was the 13th highest and the 13th lowest in the spelling contest it implies that the number of people was distributed as follows;
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25
This implies that since the median of 25 is 13, then the total number of people in the contest was 25

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2 years ago

An article presents voltage measurements for a sample of 66 industrial networks in Estonia. Assume the rated voltage for these n

kramer

Answer:

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Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 232 V

Sample mean, $\bar{x}$ = 231.5 V

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Alpha, α = 0.05

First, we design the null and the alternate hypothesis

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We use Two-tailed t test to perform this hypothesis.

Formula:

$t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n-1}} }$ Putting all the values, we have

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Now,

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Since,

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2 years ago