Large companies will hire you if you can answer this question in the interview?

There are EIGHT jars of marbles of which 7 holds marbles weighing ONE GRAM each. In the remaining jar, the marbles each weigh 1.1 grams. You also have an electronic balance which you can only use ONCE. That is, you can only look at it once. You are not allowed to fix your eyes on it, while altering what you are putting on the scales. Now the question is: how can you find out which jar it is that is holding the marbles that weigh 1.1 grams?|||What's teh answer?