Use a z-table to find the probability that a particular measurement is in a range.
You might need: Calculator,Z table

Problem

A set of mathematics exam scores are normally distributed with a mean of 80, point, 2 points and a standard deviation of 4 points.
What proportion of exam scores are between 82 and 85, point, 6 points?
Give your answer correct to four decimal places.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, p, i or 2, slash, 3, space, p, i