Dataset A has 24 observations with mean 50 and variance 16. Dataset B has 36 observations with mean 60 and variance 25. When combined, what is the variance of the pooled dataset?

Use: Variance$_{combined} = \frac{n_1}{n}s_1^2 + \frac{n_2}{n}s_2^2 + \frac{n_1}{n}(\bar{x}_1-\bar{x}_{combined})^2 + \frac{n_2}{n}(\bar{x}_2-\bar{x}_{combined})^2$