Coin Bead Necklace
April 20th, 2011
probability help please!?
1. Evangeline makes necklaces from beads of four different colors: red, white, yellow. and blue. She has twice as many red beads as there are white beads, twice as many white beads as there are yellow ones and also twice as many white beads as there are blue ones. If Evangeline chooses a bead at random from a box containing all of the beads, what is the probability that she chooses:
A) a red bead
B) A white bead
C) Either a yellow bead or a blue bead
2.Three fair coins are tossed. Find the probability of each event:
A) exactly two coins come up head
Can u explain how you got the answers? Thank you very much!!!
1. so the story for beads tell us
2 red beads = 1 white
2 white beads = 1 yellow
2 white beads = 1 blue
so 1 yellow = 1 blue
so, with the facts above, if there is 1 blue bead, then there are 2 white, 1 yellow, and 4 red.
add these up (1+2+1+4) to get 8 beads total
A) the answer is: (# of red beads) / (total number of beads)
B) (# of white beads) / (total # of beads)
C) add the number of yellow and blue beads and divide it by the total # of beads
2. If 3 coins are tossed, what are the number of results you can have?
The ways it can come up as are: HHH, HHT, HTH, HTT, THT, TTH, THH, TTT
H – Heads
T – Tails
so the answer is: (number that have 2 H’s and 1 T) / (Total number of ways it can come up as)
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