What is the probability of getting delivered.

Question

food delivery service in america has mean delivery time of 55 mins with a standard deviation of 20mins. Assuming that the distribution is normally distributed, then the probability that the food will be delivered 25 minutes is?

express answer in percentage

Answer 1

probability that the food will be delivered less 25 minutes is p(x<25)=p(z< (25-55)/20 ) = p(z < -1.5) = 0.0668