A group of surgeons have determined that average morbidity rate for the rarely performed process called bilateral cingulotomy is 10%. The procedure is performed at different hospitals for 30 years, thousands of times.
This group of surgeons determines that standard deviation of morbidity rates is 1.5%. Moreover they suppose that the morbidity rates are normally distributed. Using such model, find out the probability that the morbidity rate is less than 5 %.