Sunday

December 21, 2014

December 21, 2014

Posted by **tim** on Sunday, February 26, 2012 at 9:19pm.

determine how many of them had their homework done before class. The following arc

the results of the weekly polls:

Week # # of students with homework done

1 1

2 8

3 12

4 14

5 22

6 30

7 25

8 8

a. Calculate the median.

b. Calculate the standard deviation.

- stats -
**PsyDAG**, Tuesday, February 28, 2012 at 12:34ama. Median is the 50th percentile.

b. Find the mean first = sum of scores/number of scores

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

I'll let you do the calculations.

**Answer this Question**

**Related Questions**

math - Twelve randomly-chosen students were asked how many times they had ...

stats - Relatively speaking, which statistics exam did you do better on? On ...

Quantitative Analysis - 43) Twelve randomly-chosen students were asked how many ...

statistics - what is the standard deviation if 12 randomly chosen students were ...

statistics - A professor is interested in determining whether assigning ...

statistics - The mean grade in this class last semester was 78.3, and the ...

Stats - students reported studying an average of 9.92 hours a week, with a ...

Statistics - A student group claims that first-year students at a university ...

statistics - 1. The on-campus housing costs for a semester at a state university...

statistics - A nutritionist studying weight gain for college freshmen obtains a ...