D Question 1 2 pts Half of the students in Alice's class have a grade that is higher than hers, and half of the students have a grade that is lower. Her grade in the class must be equal to which of the following? Mean Mean and median Median Mean, median, and mode Next > Previous Not saved Submit QuizD Question 3 2 pts A data set has a mean of 12, median of 12, and standard deviation of 4. What is the variance? O 12 0 4 O 16 0 8 Next 4 Previous Not saved Submit QuizD Question 4 2 pts Household income in a neighborhood is distributed normally with a mean of $40,000 and a standard deviation of $5,000. Approximately what percentage of households has an income between $35,000 and $45,000? 68 O 95 50 O 98 Next Previous