From the question
Joshua average pace = 63 seconds per lap
Shaunice
[tex]\begin{gathered} \text{Average pace per lap = }\frac{68\text{ + 65 + 65 + 64 + 67 + 70}}{6} \\ =\text{ }\frac{399}{6} \\ =\text{ 66.5} \end{gathered}[/tex]The difference between the average pace per lap for Shaunice and the average pace per lap for Joshua = 66.5 - 63
= 3.5