Wooden poles produced for electricity networks in rural areas have lengths that are normally distributed. 2% of the poles are rejected because they are considered too short, and 5% are rejected because they are too long.a. Find the mean and standard deviation of these poles if the acceptable range is between
6.3 m and 7.5 m.b. In a randomly selected sample of 20 poles, find the probability of finding 2 rejected poles.