Question

If we toss three coins 120 times, how many times can we expect the coins to have exactly one head showing?


15

30

60

45

Answer 1

Expected Value = n*p

Find the probability of getting 1 heads with 3 coins tossed and multiply it by 120

Answer 2

would that get me 60 then ?

Answer 3

HTT
THT
TTH

that's 3 out of 2^3 total possibilities

Answer 4

\[\Large = 120 \times \frac38\]

Answer 5

45?

Answer 6

\[\huge \checkmark\]

Answer 7

thankyou