An unbiased coin is tossed 15 times. in how many ways can the coin land tails either exactly 8 times orexactly 5 times?

Probability to get tails exactly 8 times or exactly 5 times is 0.29

Step-by-step explanation:

No of ways the coins lands tails exactly 8 times

P(8) = 15C8 × ×

No of ways the coin lands tails exactly 5 times

P(5) = 15C5 × ×

Probability to get tails exactly 8 times or 5 times

P(8)+P(5) =  15C8 × + 15C5 ×

P = (  15C8 + 15C5 )

P = ( (    ) + ( ) )

P = ( 6435 + 3003 )

P = ( 9438)

P = ( 4719)

P =  

P = 0.29

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!

answer: idk

step-by-step explanation: