Final answer:
Budgeting only 1.1 hours for air conditioner service per technician might not suffice as the actual times can vary more widely. The longest 25% of furnace repair times are 3.375 hours at least, representing the 75th percentile. In automobile windshield replacement, market shares are distributed among a few key players.
Step-by-step explanation:
Budgeting Time for Technician Work
If a company has previously recorded an average of one hour per air conditioner service with a standard deviation of one hour, planning for 1.1 hours per service technician may not be enough. Given that the duration follows a normal distribution, approximately 68% of the service times fall within one standard deviation from the mean (between zero and two hours), and 95% fall within two standard deviations (between -1 and 3 hours). Scheduling for only 1.1 hours per technician could result in underestimating the time required, as there is a significant chance that a number of services will take longer than the budgeted time.
Longest 25 Percent of Repair Times
For furnace repairs, if the longest 25 percent of repair times are known to take at least 3.375 hours, this corresponds to the 75th percentile. In the case of study hours, if 30 percent of students study seven or fewer hours and 70 percent study more, the 30th percentile would be seven hours or less of study time.
Market Shares for Automobile Windshield Replacement
The data for market shares show various companies or groups having 10%, 8%, 42% combined, and 24% combined shares of the market. This information helps in understanding the competition and customer choice patterns in the windshield replacement industry.