Fill in each blank so that the resulting statement is true. In a normal distribution, approximately $q,\%$ of the data items fall within $1$ standard deviation of the mean, approximately $q,\%$ of the data items fall within $2$ standard deviations of the mean, and approximately $q,\%$ of the data items fall within $3$ standard deviations of the mean. $q,$ In a normal distribution, approximately $\%$ of the data items fall within $1$ standard deviation of the mean, approximately of the mean, and approximately $\%$ of the data item