Z = (score-mean)/SD
Use the Z table.
The number of hours that college students sleep on a week night is approximated by a normal curve with a mean of 7 hours and a standard deviation of 1.7 hours. Answer the question below using a z table:
About what proportion of students sleep less than 5 hours on a week night? (round to whole number)
About 16%
About 24%
About 12%
About 32%
3 answers
yes
About 32%
1 answer