Are avid readers more likely to wear glasses than those who read less frequently? Three hundred men in Ohio were selected at random and characterized whether they wore glasses and whether the amount of reading they did was above average, average, or below average. The results are presented in the following table:

Suppose we wish to test the null hypothesis that there is no association between the amount of reading and wearing glasses. Under the null hypothesis, what is the numerical value of the chi-square statistic?