please help!

Question

First digit 1 2 3 4 5 6 7 8 9
Proportion 0.303 0.175 0.114 0.083 0.058 0.057 0.034 0.033 0.143

 

Fake records usually have fewer first digits 1, 2, and 3. What is the approximate probability, if Benford's Law holds, that among 1155 randomly chosen invoices there are no more than 684 in amounts with first digit 1, 2, or 3? (Round your answer to four decimal places.)

Answer 1

=684/1155=0.5922 which is same as adding =.303+.175+.114=.592