Is this ER Diagram of a Bank Account correct? : > • Each customer has a name, a permanent address, and a social security
> number.  • Each customer can have multiple phone numbers, and the same
> phone number may be shared by multiple customers.  • A customer can
> own multiple accounts, but each account is owned by a single customer.
> • Each account has an account number, a type (such as saving,
> checking, etc.), and a balance  • The bank issues an account statement
> for each account and mails it to its account owner every month. As
> time goes on, there will be multiple statements of the same account. 
> • Each statement has an issued date and a statement ID.  All the
> statements of the same account have different statement IDs, but two
> different accounts could have statements with the same statement ID. 
> For example, it is possible that account A has a statement with ID
> ‘123', while account B has another statement with the same ID '123'.

[![enter image description here][1]][1]

I have a few questions:

(1) Can Min-Max notation be used in case of any relationships, or, just when there is an indication for that in the description?

(2) Are my many-to-many relationships portrayed correctly here?

(3) Could I properly portray the relationships among Account vs Account Statement vs StatementID? 

(4) As per my assumption, Is Account Statement really a weak entity and is `Has` really a weak relation that is dependent on Statement ID? Is issue-date a weak key?

  [1]: http://i.stack.imgur.com/pCyHQ.png