Yeah its possible to tell, only by there body language and if you ask them the same question the second time on a different occasion.
For example look at there eyes if they turn the other way when...
The average woman lies from about 1 - 5 times a dayThe average man lies from about 3 - 9 times a day.The average Teenage Girl lies 3 - 10 times a day.The average Teenage Boy lies 3 - 13 times a day.
That really depends on the person. It is different for everyone. Some people are more sociable and so they have more friends. Other people like to be alone and are more introverted so they have less....