You have a really annoying stapler that seems to randomly jam. On any given attempt to staple, it seems to independently jam 11% of the time.

a) Out of 380 papers stapled, what is the probability that your stapler will jam 31 times or fewer?

b) Find the mean and standard deviation for the number of jammed staples out of 380 attempts.

Mean:      Standard Deviation:

c) Does the normal approximation apply? Explain.

 

d) Use the normal distribution to find the probability that your stapler will jam 31 times or fewer out of 380 attempts.