Misc: MUSIC; Who had a no 1 hit in 1968 with Ob-la-di ob-la-da?

Questions

How many picture cards are there in a standard pack of playing cards?

How many red blood cells does an average human have?

In an average lifetime, the average aAerican drives 55,372 miles on ?

In which trials were former Nazi leaders tried as war criminals?

Much of the current we use today is in ac/dc form, its popularity and practicality was attributed to this person?