If the average income (in thousand dollars) in a certain city is 30 with a standard deviation of 10. What can we conclude from this information? Approximately 99.7% of the incomes are between 10 and 50. Approximately 95% of the incomes are between 10 and 50. At least 75% of the incomes are between 10 and 50. Approximately 68% of the incomes are between 20 and 40. At least 95% of the incomes are between 10 and 50