WEBVTT

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Welcome to coding exercise.

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9:00 we are here on the Jupiter desk what an hour exercises.

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The file is still on the desktop

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and we are still in Part 1.

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And we select the two but a notebook for exercise nine

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in exercise nine you will have the opportunity to perform group by operations.

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So first of all you have to group the list things that are framed by one key and calculate the group

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specific means and also maximum values.

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Then you have to group the data frame by two keys and calculate the size of each group and finally you

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have to rearrange a data frame with the unstick method so that's exercise nine.

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I hope you are fun and the feel free to have a look at these solutions notebook and also these solutions

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video by.