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a bag contains 6 red marbles 3 white marbles 7 blue marbles. You pick them up without looking. find the probability of drawing a white marble?

a standard number cube with the numbers one through six is rolled. Find the probability of not rolloing a number less than 3?

A number cube is rolled 360 times and the results are recorded as followes: 54ones, 60twos, 66 threes, 71 fours, 35fives, 74sixes. What is the experimental probability of rolling a two or a three?

Respuesta :

hlemaire
for your first one: add all of the marbles together
6+3+7= 16
your ratio is white marbles to total number of marbles. 3:16

for your second one: 1, 2, 3, 4, 5, 6
you only want the numbers less than three. 1 and 2. 
you have a total of 6 numbers and two of these are less than 3. so the probability would be 4:6

for the third one: add your twos and threes
60+66= 122
your probability is 122:360

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