Q-

Delhi's Traffic police claims that whenever any rally is organized in the city, traffic in the city is seriously disrupted. On the day of rally, city's traffic is disrupted for about 3 hours (180 minutes) on an average with a standard deviation of 45 minutes. It is believed that the disruption of traffic is normally distributed. If on a certain day, a rally is organized in the city what is the probability that:

(a) Traffic was disrupted up to 2 hours.

(b) Traffic was disrupted up to 5 hours.

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