A Company Makes 50 Deposits to Their Bank in One

Short Answer

A company makes 50 deposits to their bank in one month. Four of the deposits are mistakenly written in the company's ledger as $2 more than actually deposited and three of the deposits are mistakenly recorded in the ledger as $2 less than was actually deposited. If the CEO checks the book keeping by comparing the sum of 6 random deposit receipts to the sum of their records in the ledger, what is the probability he thinks the ledger is accurate?