Question

A box has 8 beads of the same size, but all are different colors. Tamy draws a bead randomly from the box, notes its color, and then puts the bead back in the box. She repeats this 3 times. What is the probability that Tamy would pick a red bead on the first draw, then a white bead, and finally a red bead again?

Answer 1

She puts the r brad back in the box each time (replacement) each time she draws, the box has 8 beads total.

For the first pick: for a red bead, calculate (# of red beads)/(total # of beads)

For the second, repeat the same process with white beads

For the third, it’s the same probability as the first pick

Then multiply all three probabilities together