Question

QUESTIONS CONCERNING PROBABILITY.. WILL MEDAL. MAYBE FAN

Answer 1

A bag has 5 red marbles, 6 blue marbles and 4 black marbles. What is the probability of picking a blue marble, replacing it, and then picking a black marble?

Answer 2

When it comes to probability it always involves fractions So in this case we got 15 marbles so that will be the denominator.

Answer 3

the probability that the first marble selected is black is the ratio of the black marbles to the total, \[\frac{ 4 }{ 15 }\]

Answer 4

then the probability that the second marble chosen is blue is also the ratio of the number of blue marbles to the total number of marbles, \[\frac{ 6 }{ 15 }=\frac{ 2 }{ 5 }\]

Answer 5

the probability that BOTH things occur, i.e. the first is black AND the second is blue is the product of those to numbers. namely \[\frac{ 4 }{ 15 }*2/5\]

Answer 6

Dot he steps look clear?