How is the interquartile range calculated?

a. find the difference between the values for quartile 3 and quartile 1.
b. find the difference between the values for the maximum and minimum.
c. find the difference between the values for quartile 2 and quartile 1.
d. find the difference between the values for the maximum and median.

Captain umaima has a ship, the h.m.s. khan. the ship is two furlongs from the dread pirate nadia and her merciless band of thieves. the captain has probability 3/7 of hitting the pirate ship. the pirate only has one good eye, so she hits the captain's ship with probability 2/5. if both fire their cannons at the same time, what is the probability that the captain hits the pirate ship, but the pirate misses.