Home › Praxis Core (Teaching) › Mathematics › The Normal Distribution › On a final exam, 39 percent of students scored l…
On a final exam, 39 percent of students scored less than 75. What percent scored higher than 75?
A61 percent
B39 percent
C50 percent
D78 percent
Answer & Solution
Correct answer: A. 61 percent
1. Every student either scored below 75 or above it, so the two shares must add to 100 percent.
2. The share below 75 is 39 percent.
3. So the share above is 100 minus 39.
4. That leaves 61 percent scoring higher than 75.
_Source: OpenStax High School Statistics (CC BY 4.0), section 6.2 Using the Normal Distribution_
Related questions
Recognising the standard normal distribution matters because it can then be:The z-scores minus 2 and plus 2 correspond to which pair of original values in a distributIf about 68 percent of values lie within one standard deviation, the share lying outside tA z-score of zero corresponds to a value that is:Two normal curves with different standard deviations must still have equal:A normal distribution is often described by the shape of its curve as:The z-scores that bound the middle 99.7 percent of a normal distribution are:Between one standard deviation and two, the extra share of values captured is about: