It means multiply by two. As in "what is twice 3" that means what is 3x2.
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Average is a synonym for mean (the mathematical term not the adjective)
I'm not a mathematician, but as far as I know the word 'random' means there is no pattern to a sequence of occurrences. So, if you selected a series of numbers at random, you should not be able to find any mathematical pattern or relationship between them.
Probablity of picking up 3 vowels from the word MATHEMATICS Each of the letters in the word MATHEMATICS is on a letter tile in a bag
The word typically mean: in a typical manner; "Tom was typically hostile".
Mean is the average.