Checking Accounts a Bank Has Determined That the Monthly Balances of the Balances

Short Answer

Checking Accounts
A bank has determined that the monthly balances of the checking accounts of its customers are normally distributed with an average balance of $1,200 and a standard deviation of $250. ​ ​
-{Checking Accounts Narrative} What proportion of customers have monthly balances between $950 and $1,075?