The absolutely perfect webpage for your question.
Just plug in the values
http://davidmlane.com/normal.html
The amount of time a student spends completing homework per week their senior year is normally distributed with a mean of 5 hours and a standard deviation of 1.4
A. Find the probability a randomly selected student spends less than 3 hours completing homework
B. Find the probability a randomly selected student spends more than 7 hours completing homework
C. Find the probability a randomly selected student spends between 4 and 6 hours completing homework
D. Find the amount of time a student spends on homework if their time creates the 15th percentile
E. Find the amount of time a students spends on homework if they are in the top 10% of all students
1 answer
1 answer