Your science teacher asks you to find an Erlenmeyer flask. Your teacher says it has a flat bottom, a narrow opening, and a cone-shaped base. Based on this description, which is the correct flask?

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?