2. Shaver Manufacturing,Inc., offers dental insurance to its employees. A recent study bythe human resource director shows the annual cost per employee peryear followed the normal probability distribution, with a mean ofS1,280 and a standard deviation of $420 per year. a. What fraction of the employees cost more than $1,500 per year fordental expenses? b. Whatfraction of the employees cost between $1,500 and $2,000 peryear? C. Estimate the percent that did not have any dental expense. d. Whatwas the cost for the 10% of employees who incurred the highestdental expense