Question

If you roll a number cube 12 times, about how many times would you expect to roll a 5 or 6?
A. 2
B. 5
C. 4
D. 10

Answer 1

merry, u hav any guess on how to do this one?

Answer 2

:(

Answer 3

a dice hav 6possible outcome. so probability 5or6 occur:
p(5 or 6)= 1/6+1/6= 1/3
since it rolled 12times, expected number of 5or6 occur is:
E(5 or 6)= 1/3*12= 4

Answer 4

thats exactly what i guessed