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grouped frequency distribution table

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I managed to do all my other questions but I can't figure these two out. They are not fully explained in the book and I can't figure it out by searching for help online. I need this within the next 3 hours because it is due tonight. I've worked ALL day on this and just can't get these two problems! If you could explain how to do them, I would like to learn so I don't get behind in class.

Thanks for your help...

1. Construct a grouped frequency distribution table for the following scores, which range from a high of 97 to a low of 56.

85, 92, 66, 81, 84, 79, 97, 88, 72, 83, 56, 85, 93, 76, 70

89, 91, 84, 74, 92, 95, 80, 77, 85, 93, 68, 88, 84, 86, 79

2. each value requested for the set of scores summarized in the following table:
a. N =
b. Ex =
c. Ex2=

X F
4 2
3 2
2 4
1 2
0 1

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This solution goes through how to construct a grouped frequency distribution table.

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