1. In a city, it is estimated that the maximum temperature in June is normally distributed with a mean of 280 and a standard deviation of 5.40. Calculate the number of days in this month in which it is expected to reach a maximum of between 220 and 31 0 2. The mean weight of 800 college students is 56 kg and the standard deviation is 5 kg. Assuming that the weight is normally distributed, determine how many students weigh: a. Between 60 kg and 70 kg. b. More than 68 kg.