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March 1, 2015

Posted by **Jen** on Wednesday, October 19, 2011 at 11:48pm.

First quartile = 57 Third quartile = 87 Standard deviation = 9 Range = 51

Mean = 72 Median = 72 Mode = 98 Midrange = 57

I. What score was earned by more students than any other score? Why?

II. What was the highest score earned on the exam?

III. What was the lowest score earned on the exam?

IV. According to Chebyshev's Theorem, how many students scored between 45 and 99?

V. Assume that the distribution is normal. Based on the Empirical Rule, how many students scored between 45 and 99?

Confused!!

- Statistics -
**PsyDAG**, Thursday, October 20, 2011 at 1:44amIndicate your subject in the "School Subject" box, so those with expertise in the area will respond to the question.

1. Mode

2. (max+min)/2 = 57 (midrange)

max+min = 114

but max-min = 51

Add the two equations.

2(max) = 165, max = 82.5?

3. Continue with 2?

4 & 5. 45 and 99 are mean ± 3 SD. What does that tell you?

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