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tankabanditka [31]
3 years ago
6

There are 8 sophomores on the academic team. At the last competition, they each took the math test. Their scores were 82%, 92%,

76%, 72%, 92%, 74%, 80% and 78%. What is the median math score of the sophomores?
Mathematics
2 answers:
castortr0y [4]3 years ago
8 0

Median would be 80.75 or 79


balu736 [363]3 years ago
5 0

Answer:

The answer is 79%

Step-by-step explanation:

First we will write the numbers in order.

72, 74, 76, 78, 80, 82, 92, 92

When the given set of values have odd number of items, the median is the  center number.

But here the data set is even,so we will find the average of the two center numbers, that are 78 and 80.

The average becomes:

\frac{78+80}{2}=\frac{158}{2}=79

Therefore, the answer is 79%

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Answer:

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Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

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The margin of error of the interval is given by:

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In this problem, we have that:

p = 0.69

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So \alpha = 0.005, z is the value of Z that has a pvalue of 1 - \frac{0.005}{2} = 0.9975, so Z = 2.81.

Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.07?

This is n when M = 0.07. So

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(\sqrt{n})^{2} = (18.5658)^{2}

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4 0
3 years ago
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