Question

Using the tree diagram, you just constructed and make a table showing the probability distribution of getting zero, one, or both questions right by guessing. (i attached the tree diagram)

Answer 1

@welshfella @kropot72

Answer 2

I got:
Probability of getting zero questions right by guessing: .5626(.75)= .42195
Probability of getting one question right by guessing: (0.75)(.1875)= .140625
(0.25)(.0625)= 0.015625
.140625+0.015625= .15625
but I'm not sure if i did it correctly, can someone check my answer please?

Answer 3

don't multiply

Answer 4

the number on the right most nodes are the total probabilities already

Answer 5

oh ok so the probability of getting zero right is .5625, getting one right is .25+.1875=.4375 and getting both right would be .1875?

Answer 6

yes the probability of getting zero right is .5625,

Answer 7

the probability of getting 1 right is the sum of the two probability of the nodes in the tree that are exactly 1 right ansewer

Answer 8

yea i got .25+.1875=.4375

Answer 9

ie P(1) = P(wr) + P(rw)

Answer 10

0.25 is the probability that the first question is right, but we want to add the probabilities that exactly one question is right

Answer 11

oh sorry so its .1875+.0625= .25

Answer 12

nope

Answer 13

add these