5000 candidates appeared at an examination, in which the minimum for a pass is 40 and the minimum for a distinction is 50. if it is known that the average mark obtained by the candidates is 43 and the s.d. is 7, find how many of the candidates expect to get simply 'pass' and the number obtaining distinction. assume normal distribution. given (0.43) 0.6664, o (1) = 0.8413.
