course Phy 201
1 4.75 4.75
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2 4.890625 .140625
3 5.046875 .15625
4 5.203125 .15625
5 5.359375 .15625
6 5.53125 .171875
7 5.6875 .15625
8 5.859375 .171875
9 6.03125 .171875
10 6.1875 .15625
11 6.375 .1875
12 6.5 .125
13 6.671875 .171875
14 6.84375 .171875
15 6.984375 .140625
16 7.15625 .171875
17 7.328125 .171875
18 7.5 .171875
19 7.671875 .171875
20 7.828125 .15625
21 8.015625 .1875
22 8.1875 .171875
AVERAGE=0.372159091
Average was achieved by submitting time interval between second click through the twenty second click into a spreadsheet and using the =AVG() tool to average the intervals.
time intervals and their frequency
.140625,2
.15625,6
.171875,10
.1875,2
.125,1
Take 10 slow breathe exercise:
829.5156
2.5625
5.515625
5.46875
5.78125
5.5625
5.375
5.75
5.75
5.84375
I believe that answer b is correct, but have no reasoning, just a guess.
This exercise took me about 30 minutes to complete.
Your data look good.