Each number is obtained by doubling the previous number and then subtracting a number that itself keeps doubling:
15 times 2 is 30, minus 1 is 29
29 times 2 is 58, minus 2 is 56
56 times 2 is 112, minus 4 is 108
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add numbers and divide by number of entries to get mean 108/5 = 21.6
29
-15
29 over 24 as a mixed number is 15/24
How about 29+79 = 108