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1 x 85, 5 x 17,
(30 + 3√85) ≈ 57.659 (30 − 3√85) ≈ 2.341
85 multiply by 5
You can calculate that as follows: 85 - 15 - 1. If you want to include both endpoints (greater or equal to 15, less than or equal to 85), the calculation becomes 85 - 15 + 1. You can verify that this is correct, using smaller numbers - for example, "how many numbers are between 1 and 5".
If three of the four numbers are 79, 80, and 65, and the average is 85, then the final number will equal (85 x 4) - 79 - 80 - 65 = 116.