Q-2(a)A company gives an aptitude test to potential employees. The scores are normally distributed with mean 250 and S.D 50.What is the probability that a score is selected at random will be Between 230 and 260.

[2.5 Marks]

Q-2(b) The burning time of an experimental rocket is a random variable having the normal distribution with and seconds. What is the probability that the rocket will burn

(i)less than 4.66 sec

(ii)more than 4.8 sec

(iii) anywhere from 4.7 to 4.82 sec.