3.Based on a sample of 50 patients, the time it takes for a certain pain reliever to reduce symptoms is 30 minutes, with a sample standard deviation of 4 minutes.Assuming the variable is normally distributed, find the probability that it will take the medication less than 29 minutes to begin to work.

a..4013.

b..5987.

c..0385.

d..6057.

4.Based on a sample of 50 patients, the time it takes for a certain pain reliever to reduce symptoms is 30 minutes, with a sample standard deviation of 4 minutes.Assuming the variable is normally distributed, find the probability that it will take the medication between 31 and 32 minutes to work.

a..0530.

b..0383.

c..0928.

d..1056.