Write the equation of the following polynomial function, p(x), of least degree in ​standard form. The graph has a y intercept of (0, 4). It touches and turns at (1⁄3, 0). X = 3i is a zero of the function.

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?