Question

A fair coin is flipped repeatedly until tails shows.
1) What is the probability of the game stopping on exactly the 7 th flip?
2) What is the probability of the game stopping on one of the first 8 flips?

Answer 1

50 50

Answer 2

you want probability of P(FFFFFFS)

Answer 3

k

Answer 4

this is a geometric distribution btw

Answer 5

density

Answer 6

I think the first one is \[\large 0.5^7\]

Answer 7

k

Answer 8

The second one would most likely then be:\[\large \sum_{n=1}^{8}0.5^n\]

Answer 9

Let wolfram add em up , if you can't remember the formula.
or add them manually

Answer 10

\[\huge 0.5+0.5^2+..+0.5^8\]

Answer 11

i guess that is for the second one which .9961

Answer 12

first one is .0078

Answer 13

thx you so much

Answer 14

no prob