Which set is finite?
{x | x ∈ n and x < 100}
{2, 4, 6, 8, 10, 12, . .}
{x | x ∈ n and x > 100}
{x | x ∈ n and x is odd}

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?