Posted by **Lyndyc** on Saturday, December 7, 2013 at 9:02pm.

Find the Standard Deviation for this distribution of scores. Then find the z score for X=86. N=17

98, 92, 86, 84 , 76, 74 , 72 , 72, 72 , 70, 70, 66, 60 ,54, 32,30

- Statistics -
**PsyDAG**, Sunday, December 8, 2013 at 12:48pm
Although you indicate n = 17, you only have 16 scores listed.

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

Z = (score-mean)/SD

I'll let you do the calculations.

## Answer this Question

## Related Questions

- math - Statistics: Analyze student exam scores Students were given an exam with ...
- statistics - For a normal distribution with a mean of 140 and a standard ...
- Math/Statistics - A statistics teacher believes that the final exam grade for ...
- Statistics - The distribution of IQ scores is a nonstandard normal distribution ...
- statistics - 2. Why is it important to know the mean and standard deviation for ...
- Analytical Skills - If your score on a statistics exam was 76 and the professor ...
- statistic - In a population of exam scores, a score of X 48 corresponds to z...
- Stastics - When we convert x-value to z- score and use Standard Normal ...
- math - Students were given an exam with 300 multiple-choice questions. The ...
- Statistics - The distribution of scores on a test is mound-shaped and symmetric ...

More Related Questions