You are given a list of numbers J and a single number p. Write a function to return the minimum and maximum averages of the sequences of p numbers in the list J.

For example, given:

J = [4, 4, 4, 9, 10, 11, 12]

p = 3

The sequences will be:

(4,4,4)

(4,4,9)

(4,9,10)

(9,10,11)

(10,11,12)

Here the minimum average will be 4 and the maximum average will be 11, which corresponds to the first and last sequences.

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