A set of final examination grades in an interductory statist

A set of final examination grades in an interductory statistics course is normally distributed, with a mean of 73 and a standard deviation of 7 (d). The probability that a student scored below 85 is 9564. b. What is the probability that a student scored between 66 and 92? The probability that a student scored between 66 and 92 is 8379. the probability is 15% that a student taking the test scores higher than what grade? The probability is 15% that a student taking the test scores higher than .

Solution

The z-value needs to be calculated for which Probability or p-value comes out to be 0.15

P[ Z > z ] = 0.15

=> z = 1.03644

=> (x - 73)/7 = 1.03644

=> x = 80.25508