The first and second term of a linear sequence (A. p) are 3 and 8 respectively. Determine the least number of terms of the A. P that must be added so that the sum is greater than 250.​

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?