Answer
$X^2_0=10.359$
Work Step by Step
$X^2_0=Σ\frac{(O_i-E_i)^2}{E_1}=\frac{(64-78.55)^2}{78.55}+\frac{(59-52.37)^2}{52.37}+\frac{(44-41.89)^2}{41.89}+\frac{(32-26.18)^2}{26.18}+\frac{(86-71.45)^2}{71.45}+\frac{(41-47.63)^2}{47.63}+\frac{(36-38.11)^2}{38.11}+\frac{(18-23.82)^2}{23.82}=10.359$
