Originally Posted by

**mastermin346** thanks archie meade

how about this..

In standard sports of a school,all students took part in the 100m race.The time taken to finish the race by a Form 2 student in normally distributed with a mean of 15 seconds and variance of 25 seconds^2.For a student who took less than 16 seconds,1 mark was awarded and for one who took less than 14 seconds,2 marks were awarded.

a)find the percentage of Form 2 students who got 1 mark each.

b)Find the number of Form 2 students who got 2 marks if 200 Form 2 students took part.