enter your numbers on this web page and you can see that the answer is 82%
http://davidmlane.com/hyperstat/z_table.html
If you play around with things a bit, it should make things clearer.
The time required to finish a test in normally distributed with a mean of 40 minutes and a standard deviation of 8 minutes. What is the probability that a student chosen at random will finish the test between 24 and 48 minutes?
82%
2%
84%
16%
1 answer
2 answers