What are the highest and lowest numbers you can possibly score?

Question

Calculate the numbers in the order shown, do not change the order of the numbers.

Replace each question mark with a mathematical sign.

Plus, minus, multiply and divide can each be used once only.

What are the highest and lowest numbers you can possibly score?

3 ? 5 ? 8 ? 5 ? 6 =

Answer 1

3+5*8-5/6 = 42.17
3-5*8+5/6 = -36.17

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Here is all possible ways and results sorted from high to low:
3+5*8-5/6 = 42.17
3+5*8+5-6 = 42.00
3/5+8*5-6 = 34.60
3-5/8+5*6 = 32.38
3/5-8+5*6 = 22.60
3*5+8-5/6 = 22.17
3*5-8/5+6 = 19.40
3*5+8/5-6 = 10.60
3*5-8+5/6 = 7.83
3-5+8/5*6 = 7.60
3-5/8*5+6 = 5.88
3/5*8-5+6 = 5.80
3-5+8*5/6 = 4.67
3/5*8+5-6 = 3.80
3*5/8-5+6 = 2.88
3+5/8+5-6 = 2.63
3+5-8*5/6 = 1.33
3-5*8/5+6 = 1.00
3*5/8+5-6 = 0.88
3+5-8/5*6 = -1.60
3/5+8-5*6 = -21.40
3+5/8-5*6 = -26.38
3/5-8*5+6 = -33.40
3-5*8+5/6 = -36.17

Answer 2

The minimum number is 0
3 + 5 - 8 x 5 / 6 ,
The maximum number is 9,83333
3 + 5 x 8 - 5 / 6