Find the essential possibility for normal distribution.
Professor cox wants a volunteer amongst the 30 students in his statistical applications course. The average age of his students is 25 years and with a standard deviation of 3 years.
1) describe what is the probability that a student between the ages 25 to 35 years old will volunteer?
2) describe what is the probability that a student ages 19 to25years old will volunteer?
3) describe what is the probability that a student 30 years old or younger will volunteer?