A jar contains 3 red marbles, 7 green marbles and 10 white marbles. If a marble is drawn from the jar at random, what is the probability that this marble is white? Choose the correct choice.
A) 0.2	B) 0.3	C) 0.5	D) 0.7	E) 0.4
color frequency   red 3   green	7   white 10   Let P(E) be the event of getting white marble   P(E) = Frequency for white color / Total frequencies in the above table   = 10 / (3+7+10)   = 10 / 20= 
<gadget id="calculator">10 / 20</gadget>
<output>1/2 = around 0.5</output>
0.5   My answer is (0.5)
<result>C</result>
A jar contains 3 red marbles, 7 green marbles and 10 white marbles. If a marble is drawn from the jar at random, what is the probability that this marble is white?