Question

The amount of a monthly phone bill is normally distributed with a mean of $60 and a standard deviation of $12. Fill in the blanks:
68% of her phone bills are between $______________ and $______________.

Answer 1

This problem is similar to your other question, or your friend's question at:
http://www.jiskha.com/display.cgi?id=1343087495

Answer 2

28 and 100