Q8.A radar unit is installed to measure the speeds of cars on a highway. The speeds are normally distributed with mean 80 km/h and standard deviation 10 km/h. If a car is chosen at random, find the probability that car is running

(i) at less than 60 km/h

(ii) at more than 100 km/h
(iii) between 90 km/h and 110 km/h.

Solution