Find the variance of 4, 9, 14, 19 and 24 (use n as the divisor).

Mean $=14$. Squared deviations: 100, 25, 0, 25, 100; sum 250. Variance $=\frac{250}{5}=50$. (62.5 divides by $n-1$; 7.07 is the SD.)