For friend 1, the relative frequency is [tex]\frac{25}{71}\approx 0.352.[/tex]
For friend 2, it's [tex]\frac{53}{71}\approx 0.746,[/tex] and for friend 3, it's [tex]\frac{23}{71}\approx 0.319.[/tex]
Combining the data of all three would give a relative frequency of [tex]\frac{101}{213}\approx 0.474.[/tex]
If each friend were to flip a coin 710 times, assuming the coin to be a fair coin, we'd expect about half of the flips to be heads, so the relative frequency would be close to 0.5.
