Hi Jamal,

It's not clear exactly what you want. If you're trying to find out whether the data approximates a normal distribution, the first step would be to graph them. To set up the graph, you could use a formula like:
=8.74-ABS(AVERAGE(A$2:A$20)-A2)
The '8.74' is just to 'normalise' the balance of the formula to a (rough) zero base

As you'll see, your data don't bear much resemblance to a normal distribution. However, how much variation from a normal distribution is allowed is a matter of judgement.

FWIW, a normal distribution would be much closer to:
70
70.25
71.25
72.25
73.5
75
76.5
77.5
78.25
78.5
78.75
79.5
80.5
82
83.5
84.75
85.75
86.75
87

Cheers

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]