Find the distance travelled by Rubina if she takes 4 rounds of rectangular park whose length and breadth is 45m and 30m please give me a valid answer with a step by step explanation and i will mark you as brainliest

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?