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Stats question

Screen Shot 2018-02-19 at 11.57.46.png

Hi some help with this question will be appreciated. I have only started learning about covariance and variance and standard deviation lately, so I am not sure how to solve this. For part a , the solution suggests something about 68%, but I am not sure what that is. Thanks
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Notnek
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Original post by coconut64
Screen Shot 2018-02-19 at 11.57.46.png

Hi some help with this question will be appreciated. I have only started learning about covariance and variance and standard deviation lately, so I am not sure how to solve this. For part a , the solution suggests something about 68%, but I am not sure what that is. Thanks

The standard deviation is sqrt(625) = 25.

So for a), 425 is one standard deviation below the mean. In your notes/textbook you should have information about what percentage of data is within 1/2/3 standard deviations of the mean.

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