The germination time for a newly developed seed has a normal distribution, with a mean germination time of 16.4 days and a standard deviation of 2.2 days.
a. What percentage of the seeds has a germination period between 15 and 18 days?
b. What percentage of the seeds has a germination period less than 12 days?
c. 95% of the seeds have a germination period of between _________ and _________ days. (Make your interval symmetric about the mean.)
d. 80% of the seeds have a germination period of between ________days and _________ days. (Make your interval symmetric about the mean.)
e. 99% of the seeds have a germination period of at least ________ days.