Question

For a population of exam scores with u = 78 and o = 10, Hermione scores a 98 and Ron scores a 73. What is the probability that a random student chosen has a score between 98 and 73 (3 points)?

Answer 1

We assume that the scores are normally distributed. Since this is always assumed to be the case and there is no form of the distribution specified.

Let X denote the score of a student of the class

Then to find P(73<X<98)

Which is equal to

( 28578) - w 178) - (3) - () - 1(2) - 10(-0.5) 10

Where

P(x) = { expecydu

Tables are avaliable to find the values of the above function