QUESTION 6 6 +
+
1 3 5
t is an even number in the series + +
t
부
t
a)
Determine the number of terms in the series in terms of t.​

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?