The grades of a group of 1000 students in an exam are normally distributed with a mean of 70 and a standard deviation of 10. A student from this group is selected randomly. a) Find the probability tha

The grades of a group of 1000 students in an exam are normally distributed with a mean of 70 and a standard deviation of 10. A student from this group is selected randomly. a) Find the probability that his/her grade is greater than 80.  b) Find the probability that his/her grade is less than 50.  c) Find the probability that his/her grade is between 50 and 80.  d) Approximately, how many students have grades greater than 80?