math
posted by Jane on .
is this correct?
1.a jar contains 5 white, 15 violet,and 21 blue marbles. a marble is drawn at random. P(violet or white)
answer: 5x15x21= 1575
15x5=75
75/1575= 1/21
2. a number from 10 to 16 is drawn at random. P(a number greater than 14)
answer: 2/7

P(violet or white)=(5+15)/(5+15+21)
2. YOu have 7 choices (10, 11, 12, ..16)
of those, 15 and 16 are >14
Pr(greater than 14)=2/7 
24 don't know