I am doing my business statistics class and I am soooooo lost. I was hoping if there was any one who could help me with percentiles and how to calculate them. the prof wants manual calculations...

0.77 1.43 0.82 1.62 0.70 0.79 1.10 1.43 1.53 0.91 0.77
1.48 1.16 0.66 0.47 1.48 0.79 1.16 1.72 0.70 0.56

You will be asked to identify each of the following for this data set.

2. P35
3. P80

I got the answers as .784 and 1.48 respectively using minitab - but I have no clue as to how to calculate them manually.

hope some1 can help

cheers!

Darren