Question 1072758
First find the number of steps Lynn took to make a mile,
{{{3n=5280}}}
{{{n=1760}}}
So Lynn actually took 1760 steps but came out to {{{5280+98=5378}}}
So the actual stride is,
{{{S=5378/1760=2689/880}}}
or approximately, 
{{{S=3.06}}} {{{ft}}}
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Lynn should use a ruler, yardstick, tape measure, etc. something that cannot change when used multiple times.
The error would be reduce by using a larger known measurement device. 
Example, using a precisely 100' tape measure 53 times versus using a yardstick 1760 times would reduce the error.