1.35
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1,19,23,27,30 ( divided by ) 5= 20
An easy way is say that division is the same as multiplication by the reciprocal. So 8/9 divided by 3/5 is the same as 8/9 x 5/3, but this is 40/27 which is 1 and 13/27, but 13/27 is the repeating decimal .481 so the asnwer is 1.4811481...
20 appears more than any number, so it is the mode.
Prime numbers are numbers that can only be divided by one and itself. The answer is 2,3,5,7,11,13,17,19. 1 is not prime nor composite.
The mean is the sum of the values divided by the number of values. In this case (12+10+19+8+2+15+1+20+6+11+3+7)/12 = 9.5.