Captain Alex manages a charter boat service with a fleet of 7 3 0 vessels, 4 0 % of which are sailboats and 6 0 % are motor yachts. Each boat is periodically taken out of service for maintenance and repairs at Harborview Marina's workshop. On average, a sailboat is sent to the workshop 8 times every year, and a motor yacht is sent to the workshop 1 3 times each year ( assuming an year has 3 6 5 days ) . When a boat is in for maintenance and repairs, it stays in the workshop for an average of 7 days before being deemed seaworthy again.
What is the average number of Captain Alex's boats out of service at Harborview Marina's workshop?