. Among all the income tax forms filed in a certain year, the mean tax paid was $2000, and the standard deviation was $500. In a
ddition, for 10% of the forms, the tax paid was greater than $3000. A random sample of 625 tax forms is drawn. a. What is the probability that the average tax paid on the sample forms is greater than $1980? b. What is the probability that more than 60 of the sampled forms have a tax of greate