Yes! As little as 30 volts can be fatal under the right conditions.
An electric eel is capable of generating about 500 volts. ~ See related link below .
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An average sized electric eel (Electrophorous electricus) can discharge 450 volts at about 1 ampere. Dicharges of 650 volts have been recorded.
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About 400 volts to 650 volts. Depends on the size of them as well.
Halfway between means if we put the two numbers on the number line, we find the distance between the two numbers and if we go half that distance we get to the number we are looking for.Now the distance between 500 and 800 is 800-500 or 300.We need half of that which is 150. So now take 500+150=650 or take 800-150 which must also be 650.