Question

on one page of our telephone directory there were 200 telephone number the frequency distribution of their unit place digit for example in the number 2582 8573 the units digit is 3 is given in the table below a number is chosen at random find the probability that the digit is at its units place

Answer 1

So the frequency having value 14 is on the digit "6",  

total telephone numbers in telephone directory is 200 and total number of frequency on the digit 6 is 14.

=frequency on digit 6/total number of telephones

=14/200

probabaility=0.07

probability that the digit is at its units place is 0.07 only

Answer 2

14/200=0.07 is the probability