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$$\begin{array}{|c|c|}\hline Score & {Frequency} \\ \hline 90 & {3} \\ \hline 85 & {2} \\ \hline 80 & {3} \\ \hline 75 & {7} \\ \hline 70 & {6} \\ \hline 65 & {4} \\ \hline\end{array}$$What percent of the scores are within two standard deviations of the mean?

100$\%$

Intro Stats / AP Statistics

Algebra

Chapter 12

Probability and Statistics

Section 6

Statistical Measures

Sampling and Data

The Normal Distribution

Introduction to Combinatorics and Probability

McMaster University

Idaho State University

Lectures

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Okay, So in reference to that questions 24 we were able to get the average was 75.4 and the standard deviation was 7.7. We still know that information. Or to be able to answer 26. That's why that's there. Um, So the question now is changing from what percentage was once denied aviation out too soon deviations. So we already have one. Senate aviation was a 3.1 and then minus one, Senate aviation was 67.7. So we just had to take away another 7.7 in to get to center, deviations away. And then we're going to dio, uh, add 7.7 to get to dinner. Deviations away in the positive direction. So 83.1 class 7.7 is 90.8 and then 67.7 minus 7.7 is 60. So it turns out all of our test scores wherever they were, um, were between 65 90. So all of them all 25 or 100% actually end up being within two standard deviations

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