posted by BadatStat .
An instructor for a college biology lab has each of her 12 students (you are one of those 12 students) take their own SRS of 25 plants from an experimental field. She lets you know that the heights (measured in cm) of the plants in the field follow a N(50,4) distribution.
a. Find the probability that your SRS has an avg. height of at least 52 cm
b. What percentage of the 12 studnets would be expected to have a SRS with average height of at least 52 cm? Explain
c. What is the probability that one or more students choose a SRS with avg. height of at least 52 cm?
Please explain how to do this!