What is the meaning of the phrase 'average family' and the word "AVERAGE"?

Why did mr. rickey want to get black players into the major leagues?

When the subject of a sentence performs the action in the sentence the verb in the sentence is in the what ?

What is the problem with the following sentence: cameron, who has an extreme and unreasonable suspicion of other people and their motives, suffers from paranoia which is a psychological disorder characterized by delusions of persecution or grandeur, was absolutely sure that someone was following him even though he was absolutely alone and hadn't seen a car for miles and miles.