Question

Consider the probability that exactly 67 out of 294 cell phone calls will be disconnected. Choose the best description of the area under the normal curve that would be used to approximate binomial probability.

a) Area to the right of 66.5

b) Area to the right of 67.5

c) Area to the left of 66.5

d)Area to the left of 67.5

e) Area between 66.5 and 67.5

Answer 1

Option e) is correct.

e) Area between 66.5 and 67.5

P[X=67]  

=P[66.5 <X<67.5]..............................by using continuity correction.