'Staid' means characterized by dignity and propriety
Mean can mean you are being rude or in math terms it is adding a set of numbers then dividing by the total amount. ex. If your numbers are 1,2,and 3 add them to get 6 and divide by 3. You get 2.
1.not nice 2.rude and disrespectful to other people 3.opposite of nice 4.cruel 5.harsh through words or actions
it means average distance which equals the total of each distance divided by how many sets of numbers you previously added by.
Dollars cents drachmas euros and rubles are all monetary units.